Re: [linux-audio-user] My MIDI latency is crap

From: Werner Schweer <ws@email-addr-hidden>
Date: Tue May 09 2006 - 13:28:15 EEST

On Monday 08 May 2006 22:30, Lee Revell wrote:
> On Mon, 2006-05-08 at 22:15 +0100, Robert Jonsson wrote:
> > Hi Clemens,
> >
> > On Monday 08 May 2006 09:08, Clemens Ladisch wrote:
> > > Josh Lawrence wrote:
> > > > I have the local turned off on my keyboard, so that when I play a
> > > > note on the keyboard, the MIDI signal passes through MusE, and back
> > > > to my keyboard's sound generator.
> > >
> > > I tried to look at MuSE's source to see how it implements MIDI Through,
> > > but apparently MuSE doesn't do anything MIDI related.
> >
> > The unfortunate truth is that there are two muse projects. MuSE which you
> > probably looked at, a streaming server I think.. and MusE, a sequencer,
> > which is likely the one being talked about here.
> > http://muse-sequencer.org.
> >
> > Think I missed most of this thread.. the issue is midi roundtrip latency
> > I gather.
> > How much latency is 'crap'? To my knowledge MusE reschedules incoming
> > midi events using the best timing source at hand (if available rtc is
> > used, if not, alsa), latency should be negligible.
>
> What is /proc/sys/dev/rtc/max-user-freq set to?

its the highest freq a normal user (without root priviledges) can request.
I would recommend 1024 (Hz). This is the default tick rate MusE uses to
time midi events. Some tests i did a long time ago show that higher rates
did not give better precision.

/Werner
Received on Tue May 9 20:15:01 2006

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