
"Here's what I added:
44-key Yamaha keyboard (7 additional notes).
Octave-switchable crystal-controlled master oscillator.
Separate cello and violin level controls.
Switchable string chorus modes.
Split keyboard for the piano.
Proper circuitry for the high C note block.
Polyphonic flute voice (almost sine waves).
Effects section operating on the flute voice:
Wave folder to add harmonics (an "unfilter"), modulated by an LFO and/or envelope generator.
LFO modulated VCA to provide tremolo.
Envelope generator modulated VCA to provide attack-decay.
Overall volume control.
Fused AC voltage and a safer power switch (no AC on 1550C board)."
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