MATRIXSYNTH-B: 09/05/09

KORG MS-20 mono analog synthesizer

via this auction

Roland JX-3P

via this auction

Roland GR-300 Guitar Synthesizer

via this auction
"The GR-300 was considered the first "playable" guitar synthesizer. (It's predecessor, the GR-500, was plagued with tracking problems that rendered it virtually unplayable.) The GR-300 had no MIDI and could only be played through a GR-300 series guitar controller.

The actual synthesizer module sat on the floor and had the rugged appearance of a large guitar-type foot pedal (complete with carrying handles). It featured 6-voice polyphony, one voice per string and 2 oscillators per voice. Each pair of VCOs were harmonically locked to each string but could be tuned separately to play different pitches. The GR-300 also featured a VCF with variable lengthsweep up and down, and an LFO. Each string had an enable-disable switch as well as a string sensitivity switch (basically audio compression). Built-in footswitches controlled the VCO mode (single/dual), the VCO harmonize pitch (detuning of the VCO's), and the VCF mode (on, bypass, or inverted). There was also a pedal control input for the VCF. The GR-300 could output either the guitar, the synth, or a mix of the two."

Roland JP-8000

via this auction

Moog Minimoog Model D Analog Synthesizer

via this auction
"This is the Minimoog Model D Analog Synthesizer. The serial number is 7692 and it was built in August of 1976. It was just serviced by the Technologists at Good Guys Pro Audio Service in Saint Paul, MN...

What was serviced per the invoice:
1) Replaced key bushings.
2) Cleaned and adjusted all key contacts, replaced one damaged contact and leveled the keyboard.
3) Cleaned switches and potentiometers as needed.

4) Repaired controls as needed.
5) Cleaned and re-tensioned Jones plugs for keyboard and pitch bend assembly.
6) Added flag ground lug, pitch bend and modulation wheel updates.
7) Repaired pitch bender.
8) Replaced trim potentiometers on oscillator board.
9) Replaced leaky diodes on glide and filter area of board.
10) Tuned oscillators."