360 Systems Digital Synthesizer

images via this auction
"Up for auction is an extremely rare and vintage 360 Systems Digital Keyboard. It has recently been serviced. It has had all the keyboard bushing replaced with new properly lubricated bushings and the keyboard leveled. It has also had many of the capacitors in the analog signal path replaced. To my knowledge it functions 100%. It has factory installed MIDI, not retrofitted, and has been tested. It includes three PROM boards and 11 sounds. The sounds are as follows as best as I can describe them:

1. Piano - This sounds great. It has 48 PROM chips dedicated to just the piano so there is almost no "stretching" on the samples.
2. Mello Bass / Acoustic Guitar
3. Electric Guitar #1
4. Electric Guitar #2 (E to C)
5. Slap Bass 1 / Slap Bass 2
6. Rhodes
7. Oboe? / French Horn
8. Sax? / Trombone
9. Sax? (bottom octave is looped)
10. Alto Sax
11. Cello / Strings - When this sound is "doubled" it is very lush and very nice! Its best sound in my opinion.

The PROM chips are labled with the sound and chip number. They are described as follows:

1. PNO: 1-48
2. MSC2: 4-7
3. GIT7: 1-6
4. ?? (the labels came off): X4
5. FNK3: 1-8
6. RHO4: 1-4
7. HORN: 1-10
8. CEL: 1-20
9. VLN: 11-40
10. 12 Empty Slots + space for one additional PROM board for a total of 4.

The keyboard is 8 voice polyphonic and can be doubled or layered for 4 voice polyphony. The keyboard can be split and sounds can be swapped. It has pitch and mod wheels with variable LFO speed. I say that it functions like a Mellotron because it only plays the length of the sample and doesn't infinitely loop. ...Or I haven't figured that part out. The analog section of the synth's circuitry has many CEM chips for filtering and dynamics."

You can find more shots in this flickr set. via Jeremy.