>>>>> Mark Knecht <[EMAIL PROTECTED]> writes:
> I can think of my HDSP mixer as a device with 52 inputs and 26
> outputs.
In the case of the 9652, you don't have headphone outputs, so you
don't have the Digiface's 27th and 28th outputs.
> 1) 26 mixer inputs come from the HDSP's physical inputs
> - numbered 0-25 in the mixer
> - called Alsa_pcm:capture_1 - 26 in Jack
Yup.
> 2) 26 mixer inputs come from the Alsa:playback group
> - numbered 26-51 in the mixer
> - called Alsa_pcm:playback_1 - 26 in Jack
Yup.
> 1) 26 mixer outputs come from the mixer
> - numbered 0-25 out of the mixer
Yup.
> By default, the HDSP driver then takes the Alsa_pcm:playback group
> and hooks them to (more or less) matching output destinations:
Perhaps, but I'm not sure about that. I always explicitly set up the
HDSP mixer routes. I just removed all of my ALSA modules, removed the
HDSP Cardbus card, power-cycled the Multiface, and reinstalled
everything; and I had to issue an "amixer cset numid=5 26,0,32768"
command to connect alsa_pcm:playback_1 to Multiface output 1.
> so that if I connect capture_1 to playback_1 then whatever comes
> in on the ADAT-1, channel 0 input will get sent back out on
> ADAT-1, channel 1 output.
You don't connect capture_1 to playback_1, because playback_1 is a
signal coming from ALSA, going into the HDSP mixer. But you _can_
connect the signal arriving on the ADAT1:1 input (which _also_ drives
ALSA's capture_1 input) to the ADAT1:1 output with an "amixer cset
numid=5 0,0,32768" command. (But playback_1 isn't routed to the
ADAT1:1 output except by coincidence or a default setting -- playback_1
doesn't have anything to do with your ADAT1:1 input -> ADAT1:1 output
connection.)
> amixer cset numid=5 0,0,32768
> amixer cset numid=5 1,1,32768
> ...
> amixer cset numid=5 25,25,32768
> which would route each physical input to each physical output, 1
> for 1, at a volume of unity gain. (As per Marcus's notes again.)
Yup.
> What is not at all clear yet is whether a single input can go to
> multiple outs with different gains. For instance, if I execute:
> amixer cset numid=5 0,0,10000
> amixer cset numid=5 0,1,30000
Sure, that works just fine. I'll run a combined setup like this:
Monitor submix
==============================
amixer cset numid=5 0,26,20000
amixer cset numid=5 1,27,20000
amixer cset numid=5 2,26,15000
amixer cset numid=5 3,27,15000
amixer cset numid=5 4,26,10000
amixer cset numid=5 5,27,10000
DAT safety recording
==============================
amixer cset numid=5 0,24,16384
amixer cset numid=5 1,25,16384
amixer cset numid=5 2,24,12288
amixer cset numid=5 3,25,12288
amixer cset numid=5 4,24,8192
amixer cset numid=5 5,25,8192
The changes I make in the first group (headphones submix) don't have
any effect on the signal being recorded by the DAT, which is set up in
the second group.
> I am attempting to take physical input 0 and sending it to both
> the left and right outputs, but at different volumes. Is this
> legal?
Sure. Consider RME's description of TotalMix, which is "nothing more"
than a software interface (OK, I'm a hardware guy) to the HDSP mixer:
- setting up delay-free submixes (headphone mixes)
- unlimited routing of inputs and outputs (free utilisation, patchbay function)
- distributing signals to several outputs at a time
- simultaneous playback of different programs over only one stereo channel
- mixing of the input signal to the playback signal (complete ASIO Direct Monitoring)
- integration of external devices (effects etc). in real-time
- mixdown of three ADAT inputs to one (realizing two additional inputs)
RME calls the HDSP mixer in the Multiface a "720 channel" mixer, and
the one in the Digiface "1456 channels". (The 9652 would be 1352
channels, because it doesn't have the headphone outputs.) For the
Multiface, that's [18 hardware input channels + 18 playback channels]
x 20 hardware output channels. (There are only 18 playback channels
because playback_8-15 aren't used in the Multiface.)
> In my case, I use Alsa_pcm:playback_1/2 for my main speakers, and
> playback_3/4 for my headphones. The problem I've been having is that I
> didn't know how to set the volume on my speakers with no mixer. Using
> this information, I could execute:
> amixer cset numid=5 26,0,3000
> amixer cset numid=5 27,1,3000
> and now my playback_1/2 should come out of my speakers, but at
> considerably reduced volumes.
Yup.
--
Roger Williams <[EMAIL PROTECTED]>
Qux Tool & Die, Middleborough, Massachusetts
// Omne tulit punctum qui misquit utile dulci //
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