Re: pcm_multi broken in alsa-lib - no duplex mode with jackd

[John Rigg <aldev@sound-man.co.uk>]

On Thu, Mar 08, 2007 at 06:16:02PM +0100, Simon Lewis wrote:
> Dear ALSA Developers
> 
> When I attempted to combine several device drivers using the pcm_multi
> function in .asound.conf I learned the hardway that pcm_multi doesn't
> work in duplex mode with jackd. Apparently pcm_multi was broken in
> alsa-lib 1.0.9rc1 and has never been fixed.
> 
> Many JACK users have successfully used the following patch:
> 
> http://www.sound-man.co.uk/linuxaudio/pcm_multi-patch
> 
> I have since learned that many studio64 users have been bitten by this bug.
> 
> Please, please, please add the above patch to version 1.014 of ALSA libs
> before they are finally released as stable.

vote ++1

There are actually quite a few of us using multi-card setups
for high channel counts these days. The extra linking code
added to pcm_multi.c in 1.0.9rc1 stopped this from working
with jackd (which anybody using a Linux system as a serious
audio workstation will be using). I haven't noticed any problem
caused by removing it, and I've done many hours of multitrack
recording since then.

John

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