>>>>> Mark Knecht <[EMAIL PROTECTED]> writes:
>> amixer cset numid=5 26,26,16384
>> amixer cset numid=5 28,26,16384
>> amixer cset numid=5 30,26,16384
>> amixer cset numid=5 32,26,16384
>> amixer cset numid=5 27,27,16384
>> amixer cset numid=5 29,27,16384
>> amixer cset numid=5 31,27,16384
>> amixer cset numid=5 33,27,16384
> ... is the use of 26 and 27 on the output part of the command
> telling the hardware to route whatever it is that you're mixing to
> the line out connectors on your box?
Yes. (Not outputs 1 & 2, as I erroneously stated.)
> Second, where do the inputs numbered 26-33 come from.
As far as the Multiface's analogue I/O goes, channels appear to be
numbered like this:
Multiface inputs 1-8 = amixer source channels 0-7
Multiface outputs 1-8 = amixer destination channels 0-7
Multiface line (headphone) outputs = amixer destination channels 26-27
alsa_pcm:playback_1-8 = amixer source channels 26-33
So amixer cset numid=5 0,26,16384" routes the signal from input 0 to
the left headphone channel. And "amixer cset numid=5 0,0,16384"
routes the signal from input 0 to output 0. And
for i in 0 2 4 6; do amixer cset numid=5 $i,0,16384; done
for i in 1 3 5 7; do amixer cset numid=5 $i,1,16384; done
will route inputs 1+3+5+7 to output 1, and inputs 2+4+6+8 to output 2.
On playback "amixer cset numid=5 26,0,16384" routes the playback_1
source to Multiface output 1, and
for i in 26 28 30 32; do amixer cset numid=5 $i,0,16384; done
for i in 27 29 31 33; do amixer cset numid=5 $i,1,16384; done
routes playback_1+3+5+7 to output 1 and playback_2+4+6+8 to output 2.
> I presume that your use of 16384 is to reduce volume so that after
> summing 4 channels you do not create output clipping if all the inputs
> hit maximum volume at the same time?
Yes. This is just a submix for headphone monitoring, so I route it to
outputs 26 and 27. This is a monitor submix I use when recording with
ecasound. If I were using Ardour, I'd set up a monitor submix in
Ardour itself, and route outputs 1 and 2 to the headphone output with
amixer cset numid=5 26,26,65535
amixer cset numid=5 27,27,65535
> If you wanted to route input 0 directly to an output, could
> you use a command like:
> amixer cset numid=5 0,26,16384
> amixer cset numid=5 1,27,16384
This routes hardware inputs 1 and 2 to the headphone outputs.
--
Roger Williams <[EMAIL PROTECTED]>
Qux Tool & Die, Middleborough, Massachusetts
// Omne tulit punctum qui misquit utile dulci //
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