Re: [alsa-devel] [PATCH - alsa-lib 1/1] add surround21 for Echo3G devices

Then what about this:

http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/conf/cards/SB-XFi.c...

It seems to be allow the "multi-streaming" you mentioned but it doesn't need the multi plugin.

Hmm, I feel like definitions for "ttable PCMs" in Echo_Echo3G.conf should be cleaned up...

No, only those creative sound card emu10k1 and ca0106 allow up to four pcm devices

For hda, you need to change the logic of alsa playback stream similar to multiple alsa capture devices, you can use hint "indep_hp=1" to enable multi stream playback (analog and alt analog playback )

Freebsd allow you to use your hda intel as four independent pcm devices

https://www.freebsd.org/cgi/man.cgi?query=snd_hda&sektion=4&manpath=...