GSS-370 is an approximate emulation (sound-a-like) of the Yamaha PSS-370's synthesizer.

Circuit-bending modifications have been added as well.

• PSS-370's digital synthesizer controls (5 waveforms, octave of modulating oscillator, frequency modulation level, Attack, Decay, and level.  Vibrato and sustain(release) switch included)
• Switch between standard and 'circuit-bent' controls.
• Decibel reading and peak indicator.
• Gain (boost).
• V-Mod (amount note velocity will affect vibrato depth).
• Filter with cutoff, resonance (both LFO controllable), fill, and dry knobs.
• LFO with frequency and depth controls.
• Send LFO to: Pitch, PWM (active when Wave=5/pulse), Pan, or Volume.  On/off switch included.
• Mod wheel controls LFO frequency.