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Visual waveforms
Create oscillator waveforms by drawing them visually with GameMaker's animation curves.
SynthEngine
A fully-featured musical synthesizer for GameMaker.
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Play it live (or don't)
You can programmatically play your synth live with triggered notes, or render audio into a buffer or sound asset for re-using sound effects.
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Multi-Osc, Multi-LFO
Supports multiple oscillators and multiple LFOs, easily standing up to synthesizers you're used to using in standard music production.