Audio and Midi Synchronization

[Oliver Jaun]

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Hi

I'm trying to switch from Mac to Linux. I'm using UbuntuStudio. I'm happy with Ardour for audio recording and Hydrogen for Drums. I managed to synchronize Ardour and Hydrogen without any problems.

Now I have a drum beat with Hydrogen and a Bass recorded with Ardour and I would like to record a MIDI Track with Qtractor along with the drums and the bass. When I do that then MIDI is recorded, but when I play a note on beat 1 then and I look at it in the piano roll editor then this note is actually on beat 1.5 (more or less). When I listen to it then it seems to be in sync but of course this makes editing in Qtractor useless because everything is displayed delayed. The same happens with rosegraden so it doesn't seem to be a Qtractor bug.

I'm using a MidiSport 2x2 Midi-Interface but I don't think the delay comes from there because when connect my keyboard directly with e.g. LinuxSampler then I can play very nicely (short latency)

I hope someone can help.
Thanks
Oliver

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[Rui Nuno Capela]

On Wed, 28 Oct 2009 01:57:09 -0700 (PDT), Oliver Jaun <olijaun@...>
wrote:

> Hi
>
> I'm trying to switch from Mac to Linux. I'm using
> UbuntuStudio. I'm happy with Ardour for audio recording and Hydrogen
> for Drums. I managed to synchronize Ardour and Hydrogen without any
> problems.
>
> Now I have a drum beat with Hydrogen and a Bass
> recorded with Ardour and I would like to record a MIDI Track with
> Qtractor along with the drums and the bass. When I do that then MIDI is
> recorded, but when I play a note on beat 1 then and I look at it in the
> piano roll editor then this note is actually on beat 1.5 (more or
> less).

what do you mean exactly with "beat 1.5" ? is it a beat-and-half ? what
tempo (bpm)? how much is that half-beat delay in (mili)seconds? (a
screenshot would be worth a thousand words)

it might seem that your playing is just human and seldom matches the rigor
of the metronome ;)

if what you're after is quantization _while_ recording, please check
View/Options.../MIDI/Capture/Quantize global setting.

however, i would recommend you do all quantization _after_ recording, via
Tools/Quantize... from the midi clip editor menu (aka piano-roll widget).


> When I listen to it then it seems to be in sync but of course this makes
> editing in Qtractor useless because everything is displayed delayed.
> The same happens with rosegraden so it doesn't seem to be a Qtractor
bug.
>

again, how much is the delay?

 
> I'm using a MidiSport 2x2 Midi-Interface but I don't think the delay
> comes from there because when connect my keyboard directly with e.g.
> LinuxSampler then I can play very nicely (short latency)
>

what it seems might not be precise enough. maybe you can run and compare
to benchmarks with this gem:
  http://github.com/koppi/alsa-midi-latency-test


byee
--
rncbc aka Rui Nuno Capela
rncbc@...
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