Panzertank PM4 is a virtual phase modulation synth very much like the famous FM synthesizers.

It has four sinus operators (oscillators) with individual APDSR envelopes, detune and velocity sensitivity. There are six schemes or algorithms to construct the sound. The slider in upper-left corner named DEPTH  controls the overall amount of Phase Modulation so if this is set to zero, only a sine wave is heard.

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  V 1.0