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>From http://kokkinizita.linuxaudio.org/linuxaudio/index.html :
Zita-ajbridge
Zita-ajbridge provides two applications, zita-a2j and zita-j2a. They

allow to use an ALSA device as a Jack client, to provide additional

capture (a2j) or playback (j2a) channels. Functionally these are

equivalent to the alsa_in and alsa_out clients that come with Jack,

but they provide much better audio quality. The resampling ratio will

typically be stable within 1 PPM and change only very smoothly. Delay

will be stable as well even under worst case conditions, e.g. the Jack

client running near the end of the cycle
On 1 February 2013 15:36, S C Rigler  wrote:

quoted text
> On Fri, Feb 1, 2013 at 9:00 AM, James Harkins  wrote:

>

>> FWIW, I tried alsa_out once upon a time, to handle a 4-channel-out USB interface

>> that appears to Linux as two stereo devices. It was a complete disaster. After

>> booting Jack and launching alsa_out, it took between 5 and 10 minutes before the

>> devices would synchronize. Before that, constant glitching. Then, if I left the

>> devices silent for a time, they would go out of sync again after a few minutes.

>> More glitching.

>>

>> At that point, I started to feel that was no longer a viable solution to

>> explore. I (still) wouldn't trust alsa_out or _in for anything serious.

>>

>> YMMV.

>>

>> hjh

>>

>

> My primary audio interface is an Echo AudioFire 4 and I'll

> occasionally use alsa_in to route a (mono) M-Audio JamLab into

> Guitarix.  It works well enough for that and what the OP was asking

> sounded like a similar case.

>

> --Steve

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