Subject: Re: Linux sampler projects, was Re: [linux-audio-user] Some music made with Linux
From: Jesse Chappell (jesse_AT_essej.net)
Date: Mon Feb 23 2004 - 18:47:30 EET
Benno Senoner wrote on Mon, 23-Feb-2004:
> >There is no guaranteed relative timing between two notes in GSt or LS.
> >If you send two simultaneous MIDI events to GSt they will start when
> >they start, just like playing two keys on the piano. They are close to
> >each other, but they do not begin at exactly the same time.
> >
> >In Ardour, you can take the same two wave files as samples and place
> >them in a track such that their relative timing is known exactly. You
> >could, for example, play one wave file and then play the next one such
> >that it sounded exactly right. When the first wave file finishes the
> >second wave file will start. You will have a sample played on every
> >clock cycle.
> >
> >LS and GSt will not do this. They are MIDI based and certainly there is
> >jitter and no timing info in MIDI so you just cannot accomplish this
> >level of control.
> >
> >
> Not true Mark :)
> LS does not have this limitation: although the current implementation
> for now allows only
> ALSA MIDI input, Christian added a time stamped event system which was
> planned anyway
> for accuracy reasons and because it will allow LS to be turned into a
> VSTi or AU plugin.
> If some VSTi like standard and sequencers will arise under Linux, LS can
> support such features
> without needing many modifications to the engine.
In addition, work is being done on midi-over-JACK which will provide
sample accurate timestamped midi events via a new jack port type. Programs
that use this interface will get all the benefits of sample-synced
realtime performance from their sampler/synth, plus the ability
to render accurately non-realtime when JACK is in "freewheel" mode.
jlc
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