[LAD] ALSA multi plugin and JACK xrun callbacks

Jörn Nettingsmeier nettings at folkwang-hochschule.de
Sat Dec 18 14:19:14 UTC 2010

On 12/16/2010 08:49 PM, Lee Azzarello wrote:
> On Thu, Dec 16, 2010 at 1:36 PM, Lee Azzarello <lee at rockingtiger.com> wrote:
>> On Thu, Dec 16, 2010 at 6:58 AM, torbenh <torbenh at gmx.de> wrote:
>>> On Thu, Dec 16, 2010 at 08:02:29AM +0100, Luis Garrido wrote:
>>>> On Thu, Dec 16, 2010 at 4:21 AM, Lee Azzarello <lee at rockingtiger.com> wrote:
>>>>> Hello, I'm looking for some advice for an interesting symptom of
>>>>> putting my M-Audio Fast Track Pro USB sound card into ALSA multi mode.
>>>> I have no idea what might be happening, but an alternative to use
>>>> several alsa devices in jack would be the alsa_in and alsa_out
>>>> utilities shipped with jack, perhaps that will give you less trouble?
>>> hmm... the interesting thing is that he actually claims to not have
>>> trouble. he only gets xrun callbacks. this is weird.
>> I'll test the alsa_(in|out) utilities later today.
> Great success! alsa_out on the second device exposes those two
> additional channels to JACK and I can connect any application to them
> without jackd printing messages about xrun callbacks.

torben, i wonder: will alsa_[in|out] be perfectly bit-transparent when
the two interfaces it bridges are externally synced, or will its
tracking algorithm keep oscillating around the correct samplerate?

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