Roger, I think the light is just starting to turn on, or at least I can only hope... ;-) See if you can help me improve the following description.
I can think of my HDSP mixer as a device with 52 inputs and 26 outputs. The inputs look like: 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 2) 26 mixer inputs come from the Alsa:playback group - numbered 26-51 in the mixer - called Alsa_pcm:playback_1 - 26 in Jack The outputs look like: 1) 26 mixer outputs come from the mixer - numbered 0-25 out of the mixer By default, the HDSP driver then takes the Alsa_pcm:playback group and hooks them to (more or less) matching output destinations: Alsa_pcm:playback_1 -> HDSP Output 0 Alsa_pcm:playback_2 -> HDSP Output 1 ... Alsa_pcm:playback_26 -> HDSP Output 25 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. To test this idea, and using your headphone mix example, I should be able to create a hardware monitoring setup by routing physical inputs directory to physical outputs using something like this: 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.) 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 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? I'm not sure. 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. I'm going to stop and get feedback, as this is almost making sense. In the meantime, I might as well try the commands above and see if my speaker volume is under control. Thanks very much for your help! Cheers, Mark On Mon, 2003-01-20 at 02:14, Roger Williams wrote: > >>>>> Mark Knecht <[EMAIL PROTECTED]> writes: > > > This is very, very helpful. > > What will be "very, very helpful" will be Thomas's TotalMix clone! :) > > > ... it appears that the MultiFace has a slightly different > > numbering system for your analog channels, starting with 0-7 > > instead of what I think I have which starts with 1-8. > > My "amixer controls" dump looks the same as yours. I don't know what > "index=1" means, but it doesn't appear to mean that our cset indexing > begins at 1. I've got to assume that Paul or Thomas already know > everything there is to know about the HDSP mixer, and I hate to > explore known territory, but when you don't have a map... > > > When you say 'appear to be numbered like this', how did you determine > > this? Was it documented somewhere? Or did you have to test yourself? > > Well, it matches Marcus Andersson's notes on the ALSA HDSP page: > > input_source: 0-7 (analog), 16-23 (adat), 24-25 (spdif), 26-51 (playback) > output_source: 0-7 (analog), 16-23 (adat) 24-25 (spdif), 26-27 (line out) > > I found "output_source" confusing, but it makes sense if I rename it > "destination". > > > The MultiFace has 18 inputs ... so I would have expected you to list: > > Some of the numbering is discontinuous (because the Multiface doesn't > have the Digiface's ADAT2 range of channels), so the full Multiface > I/O list is: > > Inputs to HDSP Mixer > ======================================================================== > Multiface analogue inputs 1-8 = amixer source channels 0-7 > Multiface ADAT inputs 1-8 = amixer source channels 16-23 > Multiface SPDIF input = amixer source channels 24-25 > alsa_pcm:playback_1-26 = amixer source channels 26-51 > > Outputs from HDSP Mixer > ======================================================================== > Multiface analogue outputs 1-8 = amixer destination channels 0-7 > Multiface ADAT outputs 1-8 = amixer destination channels 16-23 > Multiface SPDIF output = amixer destination channels 24-25 > Multiface line (headphone) output = amixer destination channels 26-27 > > Mapping between Multiface inputs and alsa_pcm:capture channels > ======================================================================== > Multiface analogue inputs 1-8 = capture_1-8 > Multiface ADAT inputs 1-8 = capture_9-16 > Multiface SPDIF input = capture_17-18 > > > In my case I am guessing that my physical I/O numbering will be > > > HDSP 9652 ADAT-1 inputs 1-8 = amixer source channels 1-8 > > HDSP 9652 ADAT-2 inputs 9-16 = amixer source channels 8-16 > > HDSP 9652 ADAT-3 inputs 17-24 = amixer source channels 17-24 > > HDSP 9652 s/pdif inputs 25-26 = amixer source channels 25-26 > > I'm pretty sure that the amixer ranges will be 0-7, 8-15, 16-23, and > 24-25, respectively. I believe that matches the Digiface (which also > has its analogue headphone output on 26-27, as I recall). > > -- > Roger Williams <[EMAIL PROTECTED]> > Qux Tool & Die, Middleborough, Massachusetts > // Omne tulit punctum qui misquit utile dulci // > > > ------------------------------------------------------- > This SF.NET email is sponsored by: FREE SSL Guide from Thawte > are you planning your Web Server Security? Click here to get a FREE > Thawte SSL guide and find the answers to all your SSL security issues. > http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0026en > _______________________________________________ > Alsa-devel mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/alsa-devel ------------------------------------------------------- This SF.NET email is sponsored by: FREE SSL Guide from Thawte are you planning your Web Server Security? 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