Check this page: http://www.michalkaszczyszyn.com/en/tutorials/latency.html#acceptable
I was wrong, the guitar to amp latency at 1 meter away is roughly 3 ms. The accumulation of a monitors and an effect or two gets you to 8ms. Acceptable latency is 12 ms. Again, I haven't measured my rig or the latency of my old wearable rig, both both were responsive to me, so they must e at least around 12 ms. Sorry for being unscientific about it. enohp ym morf tnes -------------- Dan Wilcox danomatika.com robotcowboy.com On Mar 15, 2014, at 5:49 AM, Simon Iten <itensi...@gmail.com> wrote: > dan, no 15 ms is in no way tolerable for live use (if you have effects that > should react in realtime) it is of course ok for delay and reverb stuff. the > latency from an amp because of cable length and stuff is totally different, > since your ear actually hears where the sound comes from and can adapt. > but for studio use for example, 15 ms on a headphone is really two attacks > for evey attack. heck even 10ms is evil :-) of course your/anyones mileage > may vary. but i only wanted the box to output delay and reverb soundscape > stuff away, so i might be good. i will add analog circuitry that mixes the > dry and effect part of the signal, so i get no (very very little) latency on > the unaffected part of the signal. > > no worries as far as the script goes. i had no problems at all to follow it. > but i worked with linux a lot before. i was just suggesting, that the typical > ubuntu user would not get some of the steps in between your steps :-) > > > On 15 Mar 2014, at 02:10, Dan Wilcox <danomat...@gmail.com> wrote: > >> I haven't run any latency tests, so that might be what I'm getting. If so, >> it's acceptable for what I do. From what I've read, guitar -> effects -> amp >> latencies are already closer to 20ms. >> >> Sorry I haven't gotten back to the UDOO and pulled the relevant scripts etc >> off of it yet. I'm trying to get a few things done before I head out of town >> for work the next 2 weeks. I might be abel to get to it Sunday, but no >> promises. >> >> On Mar 14, 2014, at 8:41 PM, Simon Iten <itensi...@gmail.com> wrote: >> >>> hi dan, >>> >>> tried your setup/instructions. thanks, it now works down to 15ms. at 12ms i >>> start to get clicks here and there… >>> >>> your script has some “errors” (missing instructions a novice would not >>> understand how to deal with). do you want me to post them, or do you overdo >>> it anyway? >>> >>> thanks again >>> >>> simon >>> >>> On 13 Mar 2014, at 05:21, Dan Wilcox <danomat...@gmail.com> wrote: >>> >>>> Thanks. I was just waiting to redo my website, edit the video, put the >>>> pics together, etc etc but life and freelance work get in the way. Man, I >>>> could use a clone right about now :P >>>> >>>> On Mar 13, 2014, at 12:19 AM, Richie Cyngler <glitch...@gmail.com> wrote: >>>> >>>>> Also interested in the UDOO setup instructions so thank you. A bit OT >>>>> but, Dan, love your work (that "onward to mars patch" is awesome) thanks >>>>> for the links. I think people should post more of this sort of thing to >>>>> the list, celebrate what we make. =) >>>>> >>>>> >>>>> On Thu, Mar 13, 2014 at 11:09 AM, Dan Wilcox <danomat...@gmail.com> wrote: >>>>>> FWIW: here's a picture of my UDOO setup inside my Mars space suit >>>>>> backpack: http://www.flickr.com/photos/danomatika/13115604285/ >>>>>> >>>>>> Media of the backpack in use >>>>>> https://twitter.com/danomatika/status/433273394122207232/photo/1 & >>>>>> https://vimeo.com/86670103 (not my video, I'll put out a different edit >>>>>> soon) >>>>>> >>>>>> On Mar 12, 2014, at 10:28 AM, Dan Wilcox <danomat...@gmail.com> wrote: >>>>>> >>>>>>> I will do that later tonight when I boot the udoo and pull my run >>>>>>> scripts off of it. I'll post everything to GitHub so we can share >>>>>>> resources. >>>>>>> >>>>>>> On Mar 12, 2014, at 5:44 AM, Jamie Bullock <ja...@jamiebullock.com> >>>>>>> wrote: >>>>>>> >>>>>>>> >>>>>>>> Hi Dan, >>>>>>>> >>>>>>>> Thanks for sharing these notes. They arrived in my inbox to coincide >>>>>>>> nicely with the delivery of my quad Udoo this morning! It would be >>>>>>>> great to see a full writeup of your Udoo setup at some point as I >>>>>>>> think many people will want to be doing a similar thing. >>>>>>>> >>>>>>>> All best, >>>>>>>> >>>>>>>> Jamie >>>>>>>> >>>>>>>> >>>>>>>> On 11 Mar 2014, at 14:14, Dan Wilcox <danomat...@gmail.com> wrote: >>>>>>>> >>>>>>>>> Heres a trim of my notes: >>>>>>>>> >>>>>>>>> Enable realtime audio priority (if you haven't done it already): >>>>>>>>> >>>>>>>>> sudo su -c 'echo @audio - rtprio 99 >> >>>>>>>>> /etc/security/limits.conf' >>>>>>>>> sudo su -c 'echo @audio - memlock 250000 >> >>>>>>>>> /etc/security/limits.conf' >>>>>>>>> sudo su -c 'echo @audio - nice -10 >> /etc/security/limits.conf' >>>>>>>>> >>>>>>>>> I disable pulseaudio. Make sure pulseaudio does not respawn itself >>>>>>>>> (from >>>>>>>>> http://voices.canonical.com/david.henningsson/2012/07/13/top-five-wrong-ways-to-fix-your-audio): >>>>>>>>> >>>>>>>>> echo autospawn=no > ~/.pulse/client.conf >>>>>>>>> >>>>>>>>> Also add the following to ~/.bash_login to kill pulse audio if it's >>>>>>>>> running on login: >>>>>>>>> >>>>>>>>> # kill pulse audio if it was spawned >>>>>>>>> pulseaudio -k >>>>>>>>> >>>>>>>>> I'm not looking at the udoo run script, but I'm pretty sure I'm using >>>>>>>>> the following with the US-25EX USB soudcard: >>>>>>>>> >>>>>>>>> pd -rt -nogui -alsa -audiodev 5 >>>>>>>>> >>>>>>>>> Use pd -listdev to get the device list from alsa. I chose 5 as the >>>>>>>>> first 4 (from memory) are 1-2 (built in hardware & plugin) & 2-3 >>>>>>>>> (HDMI audio hardware & plugin). 5 is the USB hardware alsa dev. >>>>>>>>> >>>>>>>>> On Mar 11, 2014, at 4:05 AM, Simon Iten <itensi...@gmail.com> wrote: >>>>>>>>> >>>>>>>>>> without jack i should add... >>>>>>>>>> On 11 Mar 2014, at 08:55, Simon Iten <itensi...@gmail.com> wrote: >>>>>>>>>> >>>>>>>>>>> hey dan, >>>>>>>>>>> >>>>>>>>>>> unfortunately i’m in switzerland :-) >>>>>>>>>>> >>>>>>>>>>> would be great if you could post your setup somewhere or send the >>>>>>>>>>> infos! i compiled pd from source as well. i start it from console >>>>>>>>>>> (with -rt) and it works without problems with the builtin sound >>>>>>>>>>> card. maybe the cheap card from dx.com just does not work properly >>>>>>>>>>> with udoo. >>>>>>>>>>> but please post your setup. >>>>>>>>>>> >>>>>>>>>>> thanks >>>>>>>>>>> >>>>>>>>>>> On 09 Mar 2014, at 22:26, Dan Wilcox <danomat...@gmail.com> wrote: >>>>>>>>>>> >>>>>>>>>>>> I've tried my both Roland Edirol UA-25 & UA-25EX and both work >>>>>>>>>>>> great. The dedicated USB controller makes these guys work as >>>>>>>>>>>> compared to an RPI where I can't get full duplex without tons of >>>>>>>>>>>> dropouts. I'm using a Linaro install which boots to the console >>>>>>>>>>>> and runs the PD through scripting. The speed is great as compared >>>>>>>>>>>> to my old wearable computer. 4 cores makes a difference. >>>>>>>>>>>> >>>>>>>>>>>> I had to recompile my kernel to add midi support, but that's >>>>>>>>>>>> working great. It's not too bad, actually. I also built Pd-vanilal >>>>>>>>>>>> from source which was pretty easy using ./configure + make. I also >>>>>>>>>>>> have a script which fetches externals and builds/installs the >>>>>>>>>>>> agains vanilla so I have the few externals I need. >>>>>>>>>>>> >>>>>>>>>>>> As with my previous experience running Pd + embedded Ubuntu, I get >>>>>>>>>>>> great performance with RT permissions, the -rt startup flag, and >>>>>>>>>>>> ALSA. Jack is needless overheard unless you want to work with >>>>>>>>>>>> other Jack-enabeld apps. Same with X windows, although my setup >>>>>>>>>>>> was running great in X with pd + ALSA in testing. >>>>>>>>>>>> >>>>>>>>>>>> From your description, it sounds like your main issue is jack & pd >>>>>>>>>>>> are probably not running in realtime. >>>>>>>>>>>> >>>>>>>>>>>> I can sent you my install notes if you want (or put them online, >>>>>>>>>>>> as I've been meaning to). Also, are based in the NE within driving >>>>>>>>>>>> distance to Pittsburgh? We could do a patching circle/UDOO setup >>>>>>>>>>>> afternoon :D >>>>>>>>>>>> >>>>>>>>>>>> On Mar 9, 2014, at 5:14 PM, pd-list-requ...@iem.at wrote: >>>>>>>>>>>> >>>>>>>>>>>>> From: Miller Puckette <m...@ucsd.edu> >>>>>>>>>>>>> Subject: Re: [PD] udoo board sound issues >>>>>>>>>>>>> Date: March 9, 2014 at 5:07:54 PM EDT >>>>>>>>>>>>> To: Simon Iten <itensi...@gmail.com> >>>>>>>>>>>>> Cc: PD list <pd-list@iem.at> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> H iSimon - >>>>>>>>>>>>> >>>>>>>>>>>>> I haven't tried any but the built-in yet but I have a few USB >>>>>>>>>>>>> interfaces >>>>>>>>>>>>> around here that I can try. I'm about to go on an intense trip >>>>>>>>>>>>> but should >>>>>>>>>>>>> be able to do some tests when I get back, assuming nobody else >>>>>>>>>>>>> has figured >>>>>>>>>>>>> this out first. >>>>>>>>>>>>> >>>>>>>>>>>>> cheers >>>>>>>>>>>>> Miller >>>>>>>>>>>>> >>>>>>>>>>>>> On Sun, Mar 09, 2014 at 09:57:45PM +0100, Simon Iten wrote: >>>>>>>>>>>>>> hey list, >>>>>>>>>>>>>> >>>>>>>>>>>>>> does anybody that uses an udoo board have any recommendations on >>>>>>>>>>>>>> a usb-soundcard? should be very compact. >>>>>>>>>>>>>> i tried a cheap one from dx and i could not get any good results >>>>>>>>>>>>>> (loads of xruns even with periods 3 and 1024 and up frames in >>>>>>>>>>>>>> qjackctl) this is on the ubuntu version from udoo. >>>>>>>>>>>>>> are there some tweaks i can do to improve usb-sound >>>>>>>>>>>>>> capabilities? i thought maybe recompile the kernel with only >>>>>>>>>>>>>> usb-1 support since there is no option as on the pi to disable >>>>>>>>>>>>>> usb-2 via config, or am i missing something? >>>>>>>>>>>>>> is it better to use the usb-soundcard without jack (pd does not >>>>>>>>>>>>>> like the usb-soundcard either when i tried briefly)? >>>>>>>>>>>>>> >>>>>>>>>>>>>> the internal sound-input is to noisy for my application (guitar >>>>>>>>>>>>>> effect) >>>>>>>>>>>>>> >>>>>>>>>>>>>> cheers. >>>>>>>>>>>>>> _______________________________________________ >>>>>>>>>>>>>> Pd-list@iem.at mailing list >>>>>>>>>>>>>> UNSUBSCRIBE and account-management -> >>>>>>>>>>>>>> http://lists.puredata.info/listinfo/pd-list >>>>>>>>>>>> >>>>>>>>>>>> -------- >>>>>>>>>>>> Dan Wilcox >>>>>>>>>>>> @danomatika >>>>>>>>>>>> danomatika.com >>>>>>>>>>>> robotcowboy.com >>>>>>>>> >>>>>>>>> -------- >>>>>>>>> Dan Wilcox >>>>>>>>> @danomatika >>>>>>>>> danomatika.com >>>>>>>>> robotcowboy.com >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>>> Pd-list@iem.at mailing list >>>>>>>>> UNSUBSCRIBE and account-management -> >>>>>>>>> http://lists.puredata.info/listinfo/pd-list >>>>>>> >>>>>>> -------- >>>>>>> Dan Wilcox >>>>>>> @danomatika >>>>>>> danomatika.com >>>>>>> robotcowboy.com >>>>>> >>>>>> -------- >>>>>> Dan Wilcox >>>>>> @danomatika >>>>>> danomatika.com >>>>>> robotcowboy.com >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Pd-list@iem.at mailing list >>>>>> UNSUBSCRIBE and account-management -> >>>>>> http://lists.puredata.info/listinfo/pd-list >>>>> >>>>> >>>>> >>>>> -- >>>>> Richie >>>>> >>>>> www.glitchpop.com >>>> >>>> -------- >>>> Dan Wilcox >>>> @danomatika >>>> danomatika.com >>>> robotcowboy.com >>>> >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> Pd-list@iem.at mailing list >>>> UNSUBSCRIBE and account-management -> >>>> http://lists.puredata.info/listinfo/pd-list >> >> -------- >> Dan Wilcox >> @danomatika >> danomatika.com >> robotcowboy.com >
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