[PD] multi-channel IO - the scoop?

Søren Bovbjerg bovbjerg at musik.auc.dk
Thu Jan 31 09:03:55 CET 2002

If Windows-PD has to use more than 1 stereo I/O the ins and outs must be
visible to Windows in the Control Panel -> Multi Media as a Windows sound
device (so, no ASIO). Then it is normally just a matter of specifying the
number of I/O at PD start. I have a feeling though that Windows-PD is
compiled for two channel I/O only (perhaps 4 but I am sure that someone will
set me straigh on this). On Linux/Irix it normally just takes a recompile to
make PD "see" the number of I/Os. Same thing for the Windows version, I

If PD is ready to run with 4 ouputs you just type:

"PD -outchannels  4"

PD will then use the first 4 outputs.

The dacs will then be accessible as "dac~ 1", "dac~ 2" and so forth.
(Remember space between ~ and dac number).

More info in the html documentation (in your PD dir).


> I was hoping someone can summarize the state of affairs of multichannel io
> in pd?  under what circumstances is it possible?  I am using a creamware
> pulsar as my soundcard which allows me various types of multichannel io
> setups, including mme and directsound (and asio of course but i understand
> that is not currently supported), but none of them seem to work.  Why does
> pd have the option to specify the dac # if it cany only support two
> channels?  When I do a pd -listdev, I see four creamware ins and outs -
> do i access these babies?

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