At Tue, 18 Sep 2001 10:03:45 -0600,
Jack Moffitt wrote:
>
> > > The only thing I can think of is that the sound card clock is drifting
> > > too.
> >
> > Do you mean the drift as the difference between the "real" wall-clock
> > time and sequencer ticks? Or between the sequencer time and ticks?
>
> The sequencer clock generates ticks on the pcm clock interrupt. But the
> number of ticks it generates is a constant (x/y from your previous
> email). Ie, each interrupt generates the same amount of ticks, even
> though the interrupts might not be evenly spaced or maybe the interrupts
> are two short, etc.
>
> Are you able to play back midi+audio at the same time? I would be
> happy to send you the code I'm testing. Maybe you can spot the
> problem...
Yes, please send me. I'll take a look at it.
I tested alsa sequencer synchronizeed with the pcm timer used by
timidity. It worked. But tested only for a short period so the drift
was not noticed..
ciao,
Takashi
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