Gimmick Mini is a free synthesizer for OS X that generates oscillator waveforms by considering how many times to ‘twist’ the wave

Here’s what the creator has to say about Gimmick’s approach:

Gimmick’s oscillator creates waveform by setting how many times to twist it in a cycle and then divides it by scanning up and down direction, finally player can also determine ratios of each turning points.

Note: The developer notes that “Gimmick synth is under ongoing development”, so you might encounter some beta glitches.

Here’s an audio demo:

Demonstration of Gimmick Mini with Avid’s simple talk box effect.

Gimmick Mini is a free download from the Ju-X site.