Re: [Linuxsampler-devel] Roadmap (was: Latest CVS commit)

[David O. <da...@ol...>]

On Monday 12 January 2004 15.40, Peter E. Roos wrote:
> I believe the same functionality was already mentioned here in the
> ongoing discussions yesterday and today.
>
> Maybe it is an option to distinguish between SAME note stealing and
> DIFFERENT note stealing, also... ;-)

Yes, that can differ a lot between instruments. Many real instruments=20
respond to "retrigging" by adding overtones that are not there when=20
starting a note from silence. Physical modelling can simulate that=20
using a single "voice" per key/string/whatever, but a sampler or=20
other wavetable synth generally has to fake it one way or another.

That said, it's not really about stealing, in the same sense as the=20
"out of voices emergency solution" - although with certain patches,=20
you *could* end up stealing your own voice, sort of. It think the=20
normal behavior would be things like:

=09* Explicitly make your voice stop playing, and then
=09  start playing a new waveform. (Causes some delay.)

=09* Do something funny with the envelope, but just let
=09  the oscillator run.

=09* Set the old voice in release state, and then start
=09  a new voice, leaving the old voice to die alone.
=09  (This is effectively what you do if you want the
=09  first alternative, but without the note-on delay.)


> I think this is related to GigaStudio's block chord note stealing.

Can you expand on that?


> And, I believe this is probably already on the developers minds:
> treat the notes differently based on where they are in the ADSR in
> the note stealing process.

Though checking the EG isn't enough, as the waveform may affect the=20
output level more than the EG sometimes.

I use simple peak level meters in Audiality, but I don't know if=20
that's a suficient or effective solution. They just happened to be=20
there when I hacked the voice stealing code... (The meters were=20
thrown in for some audio debugging eyecandy that you can see in debug=20
builds of Kobo Deluxe. :-)=20


> I guess this can a rather intricate set of rules.

To say the least... It's hard enough to figure out what *actually* is=20
the least audible voice - and that's just the beginning!


//David Olofson - Programmer, Composer, Open Source Advocate

=2E- Audiality -----------------------------------------------.
|  Free/Open Source audio engine for games and multimedia.  |
| MIDI, modular synthesis, real time effects, scripting,... |
`-----------------------------------> http://audiality.org -'
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