Hi Mike,
The frequencies required form a chromatic octave running up from middle C:
C 261.6Hz
C# 277.2Hz
D 293.7Hz
Eb 311.1Hz
E 329.7Hz
F 349.2Hz
F# 370.0Hz
G 392.0Hz
G# 415.3Hz
A 440.0Hz
Bb 466.2Hz
B 493.9Hz
Asssuming that the signal generated by the oscillator is a square wave the frequency can then be divided by 2, 4, 8 and 16 using a 7493 IC to obtain lower octaves. It worked alright like this using the 50240 chip but it took far too much power.
The idea of using a synthesizer module does not seem practical because it requires a keyboard (or a keyboard buss) to create the control voltage required for the VCO. Any ideas?
vielle568