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

[Ralf Mardorf]

On Wed, 2010-07-14 at 17:21 +0200, Ralf Mardorf wrote:
> 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

PS: Not me playing, Qtractor is playing those instruments for me.

> 
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