Korg Polysix

via this auction

Moog Taurus

via this auction

Korg Polyphonic ensemble PE-1000

via this auction
"the following sections on the pront panel:

* Master
o Master volume
o Instrument tune
* Filter (not per key but as master "FX" changing the overall sound)
o 2 Traveller filter sliders (as seen on so many vintage Korg synths)
o Peak H (highpass filter resonsonance)
o Peak L (highpass filter resonsonance)
o Soft (adjusting the sound colour)
o Expand (adjusting the envelope modulation to the filter)
* Evelope and Waveshape
o Attack (with an off-switch in fully counter-clockwise position)
o Decay
o Sustain (acting as release)
o Waveshape selector rotary switch named "Mode":
+ narrow pulsewave
+ pulsewave
+ squarewave
+ sawtoothwave
+ chorus wave
* Preset Selction
o String
o Pipe Organ
o Brass
o Piano
o Electric Piano
o Harpsichord
o Clavichord
o Control (sets the controlls of the Envelope and "Mode" switch to active)
* Octave Coupler
o big knob to mix in a copy of the sound one octave below. Will give a detuning of two oscillators depending on the "Pitch Expand" knob in the next section.
* Pitch
o Vibrato Depth (obvious)
o Vibrato Speed (obvious)
o Glide (actully adds an upward or downward pitchbending. The 12 o'clock setting is no pitch bending.
o Pitch Expands (changes the tunning linearity, so that the pitch on the higher keyboard end is a bit to too much to high, and the lower endof the keyboard to low. Together with the Octave Coupler this is were you get the ensemble sound from.

The 5 voiceboards contain an oscillator per key. It got an labeled trimmers (on the left) to adjust the pitch of each key. Each of the twelve notes of a scale got here a single filter and VCA. The parts of the filter and the wave shape former are varying for each key. The little chip appears to be an µPC324C (low power quad operational amplifier).

Compared to the tripple top-octave voice generation of the Korg PE 2000 this is technically very differnt !"