Re: [LAD] 9 soundcards ?
On Mon, Feb 24, 2020 at 10:14:01AM -0800, Len Ovens wrote: > On Mon, 24 Feb 2020, Manuel Haible wrote: > > >> So low latency is important but sample accuracy not so much. > > The time-shift of sample-streams would be different on each start up, > > right? > > Yes, It depends on how long it takes the bridge to start up and when it gets > started. If the setup is started by a script, it depends on system load > pretty much. (Assuming this is about zita-ajbridge) No, zita-j2a and a2j measures the relative timing of Jack and Alsa periods when starting up. With the -S option (no resampling, assuming word clock sync), this is a single observation and there may be some remaining error. With resampling (no -S) the added latency will converge to a defined value, with only some jitter around this remaining. > > Would it be a good idea to apply an aliasing-filter before feeding the > > zita-resampler? > > No. Indeed no, the anti-aliasing filter is part of the resampling process. To the OP: please, no HTML on this list ! Ciao, -- FA ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
Thank you. Do 64/2 and 12/2 refer to buffer size in samples / io channels ? ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
On Mon, 24 Feb 2020, Manuel Haible wrote: Now i am proceeding with project that we talked some time ago: Now I am planning to use several RME Madi HDSPe cards and Madi/Adat converters. Running one at 96k (for audio) as master and two at 48k (for control voltages and some basic audio) resampled with zita. 3 Madi cards = 32 i/o @ 96k + 128 i/o @ 48k Can this amount of audio streams be handled by modern multicore systems? Plus DAW, plugins, ect ? With a pleasant latency? I guess yes, as there exists the RME MadiFX, too - which provides ~196 i/o @ 48k. Multicore? yes. Multithread per core? Not so much in my experience. I have not exerimented with any of this since I bought the i5 (4 cores, 4 threads) a few years ago. However, in my my experimentation leading up to that purchase, I found that 64/2 was about as low as I could go with multi thread cores, but turning the multithread(hyperthreading?) feature off in bios allowed very stable operation even down to 16/2. (using a ice1712 based PCI audio card). Be aware that the sound card itself will end up all on one thread/core. You can see this by looking at /proc/interrupts where almost all of the interrupts for the audio card wioll be on one core. So probably each of your cards will be on a different core. As you are using zita-ajbridge that is probably not a concern. >> So low latency is important but sample accuracy not so much. The time-shift of sample-streams would be different on each start up, right? Yes, It depends on how long it takes the bridge to start up and when it gets started. If the setup is started by a script, it depends on system load pretty much. Even if a jack-client is "hanging" or x-runs occure, after re-syncing the time-shift changes, right? How much of a time-shift is about to be expected? within one buffer size worth of samples. >> there is no need for sample accuracy or other sonic artifacts introduced >> by SRC What kind of sonic artefacts in the resampled audio are expected? The Zita SRC code is very good and so it is not so much anything you would hear if listening just to the resampled output. However, I would not set up a stereo pair with one resampled and the other not. Anything using close mics should be fine as is. Would it be a good idea to apply an aliasing-filter before feeding the zita-resampler? No. -- Len Ovens www.ovenwerks.net ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
Now i am proceeding with project that we talked some time ago: Now I am planning to use several RME Madi HDSPe cards and Madi/Adat converters. Running one at 96k (for audio) as master and two at 48k (for control voltages and some basic audio) resampled with zita. 3 Madi cards = 32 i/o @ 96k + 128 i/o @ 48k Can this amount of audio streams be handled by modern multicore systems? Plus DAW, plugins, ect ? With a pleasant latency? I guess yes, as there exists the RME MadiFX, too - which provides ~196 i/o @ 48k. >> So low latency is important but sample accuracy not so much. The time-shift of sample-streams would be different on each start up, right? Even if a jack-client is "hanging" or x-runs occure, after re-syncing the time-shift changes, right? How much of a time-shift is about to be expected? >> there is no need for sample accuracy or other sonic artifacts introduced >> by SRC What kind of sonic artefacts in the resampled audio are expected? Would it be a good idea to apply an aliasing-filter before feeding the zita-resampler? Gesendet: Donnerstag, 14. November 2019 um 07:34 Uhr Von: "Len Ovens" An: linux-audio-dev@lists.linuxaudio.org Betreff: Re: [LAD] 9 soundcards ? On Wed, 13 Nov 2019, Manuel Haible wrote: > - The Expert Sleepers converters will interface with an Eurorack > modular-synthesizer. > They are the only ones who have DC-coupled i/o with 20 Vpp, > for control-voltages and audio. So low latency is important but sample accuracy not so much. > And I guess there is no mastering-studio running 48k in 2020, no offence > intended. None taken. I am also pretty sure that the 96k is an advertizing feature rather than technical. More to do with not having customers walk down the street to someone who charges the same but uses 96k. If you are doing mastering as a living, using 96k is fine. Doesn't sound any better, has more losses than gains but it does keep the dollars rolling in so it is worth while. > but if I would use more than one USB 3.2 - PCIe slots in a desktop-computer, > the bandwith would be more than sufficient!??? My experience with USB 3 plugs on my desktop is that no matter where I plug in the motherboard silently routes any of them through the same USB bus anyway. Remember that they are USB 2.0 interfaces even if plugged into a USB 3.0 plug. (even if the interface says USB 3 compatable it is likely USB2.0 audio via USB 3) So adding dedicated USB PCIe cards may help, using a USB 3 hub may (or not) help. > - 96k for the Madi-Chain and 48k for the ADAT Expert Sleepers chain. > > Maybe this could be achieved > - with zita-ajbridge by re-sampling? Yes this would work. As you are usng the USB devices for voltage control there is no need for sample accuracy or other sonic artifacts introduced by SRC. > - Or with zita-njbridge in a network with one Rasperry-Pi for each > USB-connection and re-sampling? > With this I might get rid of USB-conflicts, too. Running into more possible > failures? R-pi 4 would be ok, R-pi 1-3 (so far as I know use USB internally for the network IF as well and there is only one. Rpi4 fixes this. However, network style bridging normally adds latency, so test first with one unit to see how much this is (normally one or two buffer sizes of latency). Just a quick note on 96k vs 48k for reduction of latency. While this seems like a possibility as 1024 buffer size goes through twice as fast at 96k for example. The determining factor in latency is normally not the sound card but rather USB itself (1 ms access cycle) or the amount of CPU power available for DSP. So running at 64 buffer size at 48k generally means needing to run at 128 buffer size to get the same reliability (maybe higher) > Is running different samplerates a good idea? Once you are using SRC anyway, it makes very little difference. Running them all from the same clock would be ideal. -- Len Ovens www.ovenwerks.net ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
On Wed, Nov 13, 2019 at 07:22:52PM +0100, Manuel Haible wrote: > Now I decided for a no-compromise chain (thats why I choose Linux) > - and I am aware that there are different scientific statements about 48 vs > 96k. You needn't go above 48kHz/16 bit. In double-blind tests I've yet to find anyone that can tell that apart from 192kHz/24 bit. In practical terms you're going to be listening to it with 32kHz/12 bit ears anyway ;-) -- Gordonjcp ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
On Wed, 13 Nov 2019, Manuel Haible wrote: - The Expert Sleepers converters will interface with an Eurorack modular-synthesizer. They are the only ones who have DC-coupled i/o with 20 Vpp, for control-voltages and audio. So low latency is important but sample accuracy not so much. And I guess there is no mastering-studio running 48k in 2020, no offence intended. None taken. I am also pretty sure that the 96k is an advertizing feature rather than technical. More to do with not having customers walk down the street to someone who charges the same but uses 96k. If you are doing mastering as a living, using 96k is fine. Doesn't sound any better, has more losses than gains but it does keep the dollars rolling in so it is worth while. but if I would use more than one USB 3.2 - PCIe slots in a desktop-computer, the bandwith would be more than sufficient!??? My experience with USB 3 plugs on my desktop is that no matter where I plug in the motherboard silently routes any of them through the same USB bus anyway. Remember that they are USB 2.0 interfaces even if plugged into a USB 3.0 plug. (even if the interface says USB 3 compatable it is likely USB2.0 audio via USB 3) So adding dedicated USB PCIe cards may help, using a USB 3 hub may (or not) help. - 96k for the Madi-Chain and 48k for the ADAT Expert Sleepers chain. Maybe this could be achieved - with zita-ajbridge by re-sampling? Yes this would work. As you are usng the USB devices for voltage control there is no need for sample accuracy or other sonic artifacts introduced by SRC. - Or with zita-njbridge in a network with one Rasperry-Pi for each USB-connection and re-sampling? With this I might get rid of USB-conflicts, too. Running into more possible failures? R-pi 4 would be ok, R-pi 1-3 (so far as I know use USB internally for the network IF as well and there is only one. Rpi4 fixes this. However, network style bridging normally adds latency, so test first with one unit to see how much this is (normally one or two buffer sizes of latency). Just a quick note on 96k vs 48k for reduction of latency. While this seems like a possibility as 1024 buffer size goes through twice as fast at 96k for example. The determining factor in latency is normally not the sound card but rather USB itself (1 ms access cycle) or the amount of CPU power available for DSP. So running at 64 buffer size at 48k generally means needing to run at 128 buffer size to get the same reliability (maybe higher) Is running different samplerates a good idea? Once you are using SRC anyway, it makes very little difference. Running them all from the same clock would be ideal. -- Len Ovens www.ovenwerks.net ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
On Wed, Nov 13, 2019 at 11:23 AM Manuel Haible wrote: > > I am in a love-hate relation with digital audio processing, > never experienced a converter in person that is comparable to an > all-analog chain. > Speacially the very highs and 3Dness. > I suspect you've never double-blind tested this. If you have, good for you. And I guess there is no mastering-studio running 48k in 2020, no offence > intended. > This proves absolutely nothing. Audio engineers are no more immune to marketing BS than anyone else. > It seems like this is taking care of the drifting clocks with a buffer and > alignment? > zita_a2j will resample the stream from hardware it uses to make it match the apparent difference in speed between the hardware it is using, and the hardware that the JACK server is using. There will be no drift and no alignment issues. *The RME as master? Does that mean the hardware-clock of the RME would > define the whole DSP-chain? Somewhere I read that RME-cards can only run as > slave in Linux, but maybe this is outdated?* > This is false., and was never true. > > There might be some other down-sides? Phase issues ect? ... I will read > more ... > All the downsides come from your desire to build a digital audio system with 9 clocks in it. This is absolutely the wrong thing to do. The fact that you can use software (like zita_aj2) to hide or gloss over the fact that this is wrong doesn't stop it being wrong, and doesn't get rid of the downsides of having 9 clocks. Rule #1 for digital audio: 1 clock. ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
Hello, thank you, your answers made up my mind and currently I am in the process of reading in depth about your suggestions. >> What is the use case for many sound cards ? There are two use cases: - The Madi-card should run HQ-mastering grade converters (around 16 i/o). - The Expert Sleepers converters will interface with an Eurorack modular-synthesizer. They are the only ones who have DC-coupled i/o with 20 Vpp, for control-voltages and audio. ( Any DIY solution is out of question for now, as they have a decade of experience and their gear is running smoothly ) >> Use 48000 and be happy, 96000 is >> only good for recording bats This could lead towards an endless debate, - which I am not up for in this place, but some thoughts on-topic: I am in a love-hate relation with digital audio processing, never experienced a converter in person that is comparable to an all-analog chain. Speacially the very highs and 3Dness. Now I decided for a no-compromise chain (that's why I choose Linux) - and I am aware that there are different scientific statements about 48 vs 96k. ( some: hearing range, overhead, commercials, other factors for quality as jitter, whole chain, room ect. ... vs. latency, plugin-qualities and -precision, non-ideal niquist-filters, downsampling to 44.1/16, ... ) And I guess there is no mastering-studio running 48k in 2020, no offence intended. I am a PD-programmer and do have a background in electronics and acoustics, so I guess that I know what I am talking about (as everyone does ;) But, if I would use 48k only, I could run the Expert-Sleepers converters via ADAT and yes, ideed - things would be easier. >> It looks like those ES-8's have ADAT I/O. Could you sync their internal clocks by daisy chaining them via ADAT I/O off of the RME's ADAT output? Not at 96k (and yes I know s/mux, but that's not possible here). Now I'd like to elaborate the possiblities for running the Madi-chain at 96k, at least? >> you will be using USB hubs which have been known >> to cause trouble with audio devices. so be prepared for xruns at any >> buffer size less than 1024 (maybe even there). Yes, I have read about those troubles. But now I found positive experiences, too (including the Jack-website). It is not resolved why there have been issues with multiple USB-devices (might just be clonflicts in shedueling, clocks, bandwith?), but if I would use more than one USB 3.2 - PCIe slots in a desktop-computer, the bandwith would be more than sufficient!??? Of course, faster than 1024 buffer size would be cool. >> Each card have its own hardware clock >> You would use an instance of zita_a2j to connect each "secondary" card to the JACK server which is using the "master" card. zita_a2j will resample as needed to keep things in sync. https://kokkinizita.linuxaudio.org/linuxaudio/ Very cool! I am having a close reading on this now. It seems like this is taking care of the drifting clocks with a buffer and alignment? The RME as master? Does that mean the hardware-clock of the RME would define the whole DSP-chain? Somewhere I read that RME-cards can only run as slave in Linux, but maybe this is outdated? There might be some other down-sides? Phase issues ect? ... I will read more ... Zita seems to make up many possibilities ... For now I see the following routes: - 96k for everything, RME-HDSPe-Madi and multiple USB-Expert Sleepers via zita-ajbridge ? https://www.expert-sleepers.co.uk/moduleoverview.html https://www.rme-audio.de/de_hdspe-madi.html - 48k for everything, run the Expert Sleepers i/o with Adat via RME-MadiFx (with Adrian Knoths Alsa-driver) <> RME-Adi648 or multiple RME-RayDat https://www.expert-sleepers.co.uk/moduleoverview.html https://www.rme-audio.de/de_hdspe-madi-fx.html https://github.com/adiknoth/madifx https://www.rme-audio.de/de_adi-648.html https://www.rme-audio.de/de_hdspe-raydat.html - 96k for the Madi-Chain and 48k for the ADAT Expert Sleepers chain. Maybe this could be achieved - with zita-ajbridge by re-sampling? - Or with zita-njbridge in a network with one Rasperry-Pi for each USB-connection and re-sampling? With this I might get rid of USB-conflicts, too. Running into more possible failures? Is running different samplerates a good idea? Bests, Manuel ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
Le Mon, 11 Nov 2019 20:26:47 +0100, lacu...@gmx.net a écrit : > > Hello, > > > I'd like to run up to nine soundcards with Jack. > > Eight times Expert Sleepers ES-8 via USB > and one RME Madi HDSPe card on a PCIe slot. > > In Linux at 96 kilobauds. > > I read here > https://jackaudio.org/faq/multiple_devices.html > about clocking issues as each card is run by it's own clock. > > Will the asynchronously clocked streams be handled and merged by Jack > or is this an ongoing issue? It is an hardware issue. Each card have its own hardware clock, they are some kind of quartz oscillators often associated with PLL circuitry. They are implemented into the silicon of the cards and it is nothing JACK can do about this. The only solution would be to use a Master clock, which is to use the clock of one card as clock for all the cards. That can only be done at the hardware level. In your case, that imply to modify the hardware of the cards, which, with 8 USB of one brand and 1 PCI card of another brand would be rather complicated, if possible. Even if we consider only the 8 USB cards of the same brand, it is more than doubtful the clock of one of these cards would be powerful enough to be able to drive the 8 cards. Which imply this would not be a trivial modification. Dominique -- If you have a problem and you are not doing anything to fix it, you are at the heart of the problem. ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
What is the use case for many sound cards ? Is it channel count or the need for networking or both ? Matt On 12/11/19 8:41 am, Nick Copeland wrote: * I'd like to run up to nine soundcards with Jack. * Ha, I'll raise you two. I'd like to run 11 sounds cards with Jack. At 192 mega bored. Raise me if you dare, I have a good hand, it's prime. "at the end of the day its nil nil at half time???. Trevor Brooking *From:* Linux-audio-dev on behalf of lacu...@gmx.net *Sent:* Monday, November 11, 2019 8:26 PM *To:* linux-audio-dev@lists.linuxaudio.org *Subject:* [LAD] 9 soundcards ? Hello, * I'd like to run up to nine soundcards with Jack. * Eight times Expert Sleepers ES-8 via USB and one RME Madi HDSPe card on a PCIe slot. In Linux at 96 kilobauds. I read here https://jackaudio.org/faq/multiple_devices.html about clocking issues as each card is run by it's own clock. *Will the asynchronously clocked streams be handled and merged by Jack or is this an ongoing issue? * I imagine, if I'd feed analog outputs of one card into the analog inputs of another, this wouldn't be ideal. But I am wondering if Jack is handling the asynchronous streams in the software-domain without glitches ect. ? *With a powerful computer is the latency going to rise absurdly high? Any experience with this? * As Jack-Devel-List is dead, I'm asking here. With best regards, Manuel ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
I'd like to run up to nine soundcards with Jack. Ha, I'll raise you two. I'd like to run 11 sounds cards with Jack. At 192 mega bored. Raise me if you dare, I have a good hand, it's prime. "at the end of the day its nil nil at half time???. Trevor Brooking From: Linux-audio-dev on behalf of lacu...@gmx.net Sent: Monday, November 11, 2019 8:26 PM To: linux-audio-dev@lists.linuxaudio.org Subject: [LAD] 9 soundcards ? Hello, I'd like to run up to nine soundcards with Jack. Eight times Expert Sleepers ES-8 via USB and one RME Madi HDSPe card on a PCIe slot. In Linux at 96 kilobauds. I read here https://jackaudio.org/faq/multiple_devices.html about clocking issues as each card is run by it's own clock. Will the asynchronously clocked streams be handled and merged by Jack or is this an ongoing issue? I imagine, if I'd feed analog outputs of one card into the analog inputs of another, this wouldn't be ideal. But I am wondering if Jack is handling the asynchronous streams in the software-domain without glitches ect. ? With a powerful computer is the latency going to rise absurdly high? Any experience with this? As Jack-Devel-List is dead, I'm asking here. With best regards, Manuel ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
Hi Manuel, It looks like those ES-8's have ADAT I/O. Could you sync their internal clocks by daisy chaining them via ADAT I/O off of the RME's ADAT output? - Mike On Mon, Nov 11, 2019 at 2:43 PM Len Ovens wrote: > On Mon, 11 Nov 2019, lacu...@gmx.net wrote: > > > I'd like to run up to nine soundcards with Jack. > > nope, won't happen. > > > Eight times Expert Sleepers ES-8 via USB > > USB in particular will not be in sync. > > To use them together and see the i/o on jack will require an extrenal > client or two per usb device. You could use zita-ajbridge to do that which > inserts an SRC stage between the device and jack to make syncing possible. > However, you say you want to use 8 of them. This will also be a problem at > any low latency because you will be using USB hubs which have been known > to cause trouble with audio devices. so be prepared for xruns at any > buffer size less than 1024 (maybe even there). > > > and one RME Madi HDSPe card on a PCIe slot. > > Use that as your jack master. > > > > In Linux at 96 kilobauds. > > kilobauds? you mean sample rate maybe? Use 48000 and be happy, 96000 is > only good for recording bats > > > Really, I don't know how many i/o you RME Madi has (should be 64-ish?) Add > what is needed to max that out. USB mics are for the most part toys, > better to use one of the many 18 i/o USB devices out there instead most of > which do have the ability to sync with your RME. > > I would not waste my time with USB mics. > > -- > Len Ovens > www.ovenwerks.net > ___ > Linux-audio-dev mailing list > Linux-audio-dev@lists.linuxaudio.org > https://lists.linuxaudio.org/listinfo/linux-audio-dev > ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
On Mon, 11 Nov 2019, lacu...@gmx.net wrote: I'd like to run up to nine soundcards with Jack. nope, won't happen. Eight times Expert Sleepers ES-8 via USB USB in particular will not be in sync. To use them together and see the i/o on jack will require an extrenal client or two per usb device. You could use zita-ajbridge to do that which inserts an SRC stage between the device and jack to make syncing possible. However, you say you want to use 8 of them. This will also be a problem at any low latency because you will be using USB hubs which have been known to cause trouble with audio devices. so be prepared for xruns at any buffer size less than 1024 (maybe even there). and one RME Madi HDSPe card on a PCIe slot. Use that as your jack master. In Linux at 96 kilobauds. kilobauds? you mean sample rate maybe? Use 48000 and be happy, 96000 is only good for recording bats Really, I don't know how many i/o you RME Madi has (should be 64-ish?) Add what is needed to max that out. USB mics are for the most part toys, better to use one of the many 18 i/o USB devices out there instead most of which do have the ability to sync with your RME. I would not waste my time with USB mics. -- Len Ovens www.ovenwerks.net ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] 9 soundcards ?
On Mon, Nov 11, 2019 at 12:26 PM wrote: > > Hello, > > > * I'd like to run up to nine soundcards with Jack. * > > Eight times Expert Sleepers ES-8 via USB > and one RME Madi HDSPe card on a PCIe slot. > > In Linux at 96 kilobauds. > > I read here > https://jackaudio.org/faq/multiple_devices.html > about clocking issues as each card is run by it's own clock. > > *Will the asynchronously clocked streams be handled and merged by Jack or > is this an ongoing issue? * > JACK2 (the one most commonly installed on Linux systems) can't do this by itself (for now) You would use an instance of zita_a2j to connect each "secondary" card to the JACK server which is using the "master" card. zita_a2j will resample as needed to keep things in sync. JACK1 can do this by itself because it has zita_a2j built in. However, it is a slightly older version of zita_a2j and I discovered recently that it doesn't handle xruns as well as the current zita_a2j. > > > I imagine, if I'd feed analog outputs of one card into the analog inputs > of another, this wouldn't be ideal. > But I am wondering if Jack is handling the asynchronous streams in the > software-domain without glitches ect. ? > > *With a powerful computer is the latency going to rise absurdly high? Any > experience with this? * > Number of cards has nothing to do with latency directly. "Servicing" each card will consume some of the time available for audio processing. How much is hard to say, but with mid-size buffer sizes, I would not guess that it will be too large. Since you are not sharing word clock, they will drift and zita_a2j will have to do resampling, which will also consume some CPU cycles. ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
[LAD] 9 soundcards ?
Hello, I'd like to run up to nine soundcards with Jack. Eight times Expert Sleepers ES-8 via USB and one RME Madi HDSPe card on a PCIe slot. In Linux at 96 kilobauds. I read here https://jackaudio.org/faq/multiple_devices.html about clocking issues as each card is run by it's own clock. Will the asynchronously clocked streams be handled and merged by Jack or is this an ongoing issue? I imagine, if I'd feed analog outputs of one card into the analog inputs of another, this wouldn't be ideal. But I am wondering if Jack is handling the asynchronous streams in the software-domain without glitches ect. ? With a powerful computer is the latency going to rise absurdly high? Any experience with this? As Jack-Devel-List is dead, I'm asking here. With best regards, Manuel ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-dev
