Re: [LAD] on the soft synth midi jitters ...

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From: <fons@...>
To: <linux-audio-dev@...>
Date: Tuesday, October 5, 2010 - 8:00 pm

On Tue, Oct 05, 2010 at 02:50:10PM +0200, David Olofson wrote:

> Not only that. As long as the "fragment" initialization overhead can be kept

'Fragment initialisation' should be little more than
ensuring you have the right pointers into the in/out
buffers.

> Depending on the design, a synthesizer with a large number of voices playing

> Obviously, this depends a lot on the design and what hardware you're running

Very true. The 'bigger' the app (voices for a synth, channels for
a mixer or daw) the more this will impact the performance. Designing
the audio code for a fairly small basic period size will pay off.
As will some simple optimisations of buffer use.

There are other possible issues, such as using FFT operations.
Calling a large FFT every N frames may have little impact on
the average load, but it could have a big one on the worst case
in a period, and in the end that's what counts.

Zyn/Yoshimi uses FFTs for some of its algorithms IIRC. Getting
the note-on timing more accurate could help to distribute those
FFT calls more evenly over Jack periods, if the input is 'human'.
Big chords generated by a sequencer or algorithmically will still
start at the same period, maybe they should be 'dispersed'...

Ciao,

--
FA

There are three of them, and Alleline.

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Messages in current thread:
[LAD] on the soft synth midi jitters ..., cal, (Tue Oct 5, 4:12 am)
Re: [LAD] on the soft synth midi jitters ..., Arnout Engelen, (Tue Oct 5, 7:51 am)
Re: [LAD] on the soft synth midi jitters ..., Arnout Engelen, (Tue Oct 5, 12:39 pm)
Re: [LAD] on the soft synth midi jitters ..., David Olofson, (Tue Oct 5, 12:50 pm)
Re: [LAD] on the soft synth midi jitters ..., , (Tue Oct 5, 8:00 pm)
Re: [LAD] on the soft synth midi jitters ..., Folderol, (Tue Oct 5, 8:22 pm)
Re: [LAD] on the soft synth midi jitters ..., Clemens Ladisch, (Tue Oct 5, 11:58 am)