[LAD] ALSA MIDI latency test results are far away from reality

[Ralf Mardorf]

On Wed, 2010-07-14 at 10:53 -0400, Paul Davis wrote:
> On Wed, Jul 14, 2010 at 9:52 AM, Clemens Ladisch <clemens at ladisch.de> wrote:
> > Is this connection through JACK or through ALSA, i.e., does it show up
> > in the output of "aconnect -l"?  From what I understand, JACK's sample-
> > synchronous timing always adds latency, and might add period-related
> > jitter depending on the implementation.
> 
> the good stuff adds 1 JACK period of latency to whatever the ALSA
> sequencer's direct delivery + the driver does, and zero jitter.
> 
> --p

I'm able to confirm this.
If I play a virtual JACK MIDI instrument and a virtual ALSA MIDI
instrument, 'in unison' is 'in unison'.
I dunno if there is any measurable latency or jitter, but there's no
audible latency or audible jitter and no visible jitter for audio
recordings of those virtual instruments.

- Ralf

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