A 4-voice semi-
polyphonic analog string machine with a limited
synthesizer section and a 49-note
keyboard. Released in
1979.
The
Delta is not a
real polyphonic synth, with a
system similar to the
Mono/Poly: all voices sharing the same
envelope. There is 1
VCO (with only the
square waveform), 1
resonant VCF, 1
VCA with an
ADSR envelope generator, plus a
sine-only
LFO. A
noise generator is featured, as well as a
joystick for
modulation/
pitch.
With its severely limited
capabilities, the Delta isn't very useful as a synthesizer. It also uses Korg's non-standard
Hz/
voltage interface, so it isn't compatible with
synths from other manufacturers without a third-party
converter. Reportedly one can turn the Delta into something more interesting by
tweaking the
trimmer pots inside to make the VCO
self-oscillate.
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