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 Forum index » Clavia Nord Modular » G2 Building Blocks
Anti-aliased hard sync oscillator with true quad-unison
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1023
Location: Zürich, Switzerland
Audio files: 6
G2 patch files: 212

PostPosted: Sat Apr 26, 2014 6:08 pm    Post subject: Anti-aliased hard sync oscillator with true quad-unison
Subject description: all standard waveshapes available simultaneously
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This is an uncompromisingly ambitious (and thus unfortunately expensive) building block that demonstrates a robust solution to the following problems:

arrow How to derive all classic waveforms simultaneously from a single oscillator (without resorting to trivial waveshaping methods with produce aliasing).
arrow How to generate clean oscillator hardsync sweeps without aliasing.
arrow How to create a true multi-oscillator unisono of a given complex waveform (without resorting to cheating via "chorusing" tricks).

This building block generates the classic waveforms (saw, tri, pulse with PWM) simultaneously, with low end boost for a fatter sound, anti-aliased hardsync sweep functionality (finally!), and true unison quadrupling of the resulting waveform with detune control.

It works by generating the desired waveform at a very low fixed frequency and then bandlimiting and resampling it at the desired pitch to avoid foldbacks. The resampling is performed by 'abusing' a delay-line, whose infamous and documented "readout bug" will unfortunately introduce subtle harmonic distortion into the sound. But by keeping oscillator levels high, it's quite OK. Way better than that horribly inharmonically aliasing standard G2 osc sync .

As mentioned, the circuit is hideously expensive (half a DSP). So, if nothing else, at least it's a proof of concept that these things are possible on the G2.

But if you're looking for clean sync sweeps and powerful unison for your no-compromise monosynth lead patch -here you go.


UnisonSyncOsc_TK.pch2
 Description:
No compromise oscillator building block providing all classic waveforms simultaneously with low-end boost, anti-aliased hard sync sweeping, and true quad unison; Warning: expensive!

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 Filename:  UnisonSyncOsc_TK.pch2
 Filesize:  4.06 KB
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beer

Last edited by Tim Kleinert on Sun Apr 27, 2014 4:46 am; edited 1 time in total
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ian-s



Joined: Apr 01, 2004
Posts: 2574
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 608

PostPosted: Sat Apr 26, 2014 11:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

awesome.

best sounding g2 sync ever.
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1023
Location: Zürich, Switzerland
Audio files: 6
G2 patch files: 212

PostPosted: Sun Apr 27, 2014 4:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Oops, I just discovered a minor bug in the sync engine (something had accidentally been switched off). Fixed version uploaded.
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dorremifasol



Joined: Sep 28, 2006
Posts: 775
Location: Barcelona, Spain
Audio files: 7
G2 patch files: 47

PostPosted: Fri May 02, 2014 7:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Wow, Tim does it again Very Happy
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Albert
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Lfohead



Joined: Jul 29, 2009
Posts: 267
Location: Sweden
Audio files: 6
G2 patch files: 25

PostPosted: Sat May 03, 2014 2:48 am    Post subject: Reply with quote  Mark this post and the followings unread

Amazing Tim, nice work! Very Happy
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