Onboard i2s soundcards sound like a better option for multichannel, alas the RPi only does 2 channels... unless you do some voodoo like transmitting 256 bits over two channels with a hardware divider... similar to how a certain multichannel card does it ;-)

On Sat, 7 Jul 2018 at 16:48, Fons Adriaensen <fons@linuxaudio.org> wrote:

Hello all,

Has anyone tried using multichannel USB audio on a Raspberry 3B+ ?

It seems to work perfectly (using zita-alsa-pcmi) with stereo cards.

When I try my RME Babyface (12 in, 12 out) in CC mode, the device
opens without problems, but then Alsa_pcmi::pcm_wait() times out
waiting for the poll fd to become ready. Timeout in pcm_wait() is
1000 milliseconds.

The same seems to happen with Jackd, which uses similar code.

Is there anything in the Pi's system or configuration that
excludes multichannel cards ?

Ciao,

--
FA

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