>I would check the value of the timing capacitor and also of the
>resistors in the timing circuit. I don't have a schematic in front
>of me (I'm at work) but the timing part of the oscillator is
>probably explained in Paul's explanation of the circuit. It is easy
>to pick up the wrong capacitor. You could have done this or Paul
>even could have done this. Make very sure that the value of the
>timing capacitor matches the schematic and that it is not off by a
>factor of 10. Then check the resistors around the timing cap.
>Again it is very easy to pick up a resistor that is wrong by a
>factor of 10 (wrong 3rd color band.) If all else fails, get in
>touch with the master himself.
The other thing to check is the circuitry that sums all the frequency
control inputs (RATE pot, FM input, 1 V/OCT input, top of page 1 of
schematic). If a resistor is wrong in there, then you could be
sending more current than expected to the oscillator circuit. Measure
the voltage on pin 8 of U1 of both 320s and compare at the same
setting of the RATE pot. They should be nearly the same. If not then
you got a problem there. If they are the same, then check that the
resistors around Q1 and Q2 are the same on both 320s. Those set the
current to the oscillator circuit.
If everything is good, then check the oscillator part (bottom of page
1 of schematic) as Paul H. says. The timing cap is C8.
Ignore page 2 of schematic, that's all just waveshaping.