Roland GR-100 Electronic Guitar synthesizer

via this auction

Filter, Vibrato, Chorus.

"Features of the GR-100:

Complex Hex-Fuzz Circuit
Addition Sustain Overdrive (mode 3)
6 Individual -12 dB Low-Pass Voltage Controlled Filters, One Per String
Frequency Peak and Sensitivity Controls for VCFs
Built-in footswitch controls the VCF mode (on, bypass, or inverted)
Low Frequency Oscillator, for Vibrato Effects
Lush Analog Chorus Mode
Stereo Output
Pedal control input for the VCF
The GR-100 can output either the guitar, the synth, or a mix of the two
Synchronized, flashing LED status indicators
All-Analog Construction"