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 Forum index » Clavia Nord Modular » G2 Building Blocks
True octave phase-coherent drawbars generator
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1027
Location: Zürich, Switzerland
Audio files: 6
G2 patch files: 212

PostPosted: Tue Mar 13, 2012 7:07 pm    Post subject: True octave phase-coherent drawbars generator
Subject description: No more phase-cancelling
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Generating true octave-phase-coherent organ drawbars was one of the unsolved G2 problems.

I solved it today, as good as it probably can be solved. It combines the octave-phase-coherent oscillator concept I developed a year ago with a new scaling solution which enables it to drive a bank of 0Hz sine oscillators at the ratios required by the drawbars. There's a little bit of aliasing in the highest octave due to the osc driver running at control rate. Upsampling via extrapolation is quite costly, so I skipped that. It sounds good enough to me.

It's rather expensive DSP-wise anyway, so I almost posted it in the experimental section.

This is only the raw building block. I have absolutely no talent when it comes to making convincing organ emulations. Laughing But perhaps somebody wants try it out.

Nothing this red box can't do.

cheers,
t

EDIT: I sometimes get a strange rustling artefact on certain notes, which doesn't respond to any kind of treatment. Only reloading the patch helps, which makes me suspect that there is some kind of bug there. I've been running into such strange phenomena a lot lately when patching stuff that pushes the G2 to the limits.


TrueDrawbars_TK.pch2
 Description:
Octave-phase-coherent organ drawbars generator

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 Filename:  TrueDrawbars_TK.pch2
 Filesize:  5.27 KB
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