User Manual

Calibrating the DPO

Requires small flat head screw driver or trimmer tool, tuned reference signal, oscilloscope.

NOTE: if you plan to use the DPO with another VCO or Synth in your system (even another DPO), it is a

good idea to use that VCO/ Synth for your reference signal, assuming it is calibrated to your satisfaction. The

same is true of the quantizer or MIDI to CV interface. Use the unit within your system. If you use one, a

digital midi controlled soft synth is also a nice reference signal and note generator. Be certain the reference

is not processed in any way by effects or filters or any other processes.

1V/ Octave Scale

Trims for 1V/ Octave Scaling (3A, 3B)are accessed from the front of the module so that user need not

remove the module from the system to calibrate 1V/ Octave Scaling. Calibrate the DPO while installed in the

system in which it will be utilized.

1.Monitor VCO B SINE (1B).

2. Patch quantizer or MIDI to CV interface to 1V/ Octave INput (6), set FOLLOW (5) to 0% (full counter

clockwise).

3. Patch this same quantizer or MIDI to CV signal to the reference oscillator and monitor together with the

DPO VCO B SINE. If using digital/ soft synth for reference, just pass midi note to MIDI to CV interface

connected to DPO.

3. Send note C6 to the both DPO VCO B and your reference oscillator, and adjust the FREQ (2A) and FINE

TUNE (4A) Panel Controls so the DPO pitch matches that of the reference.

4. Send note C3 to the both DPO VCO B and your reference oscillator, and adjust the 1V/ Octave Trimmer

(3B) on the DPO so the pitch matches that of the reference.

5. Repeat steps 3 and 4 until satisfaction or exhaustion is achieved.

6. Check across 4 or 5 octaves and adjust if necessary. The DPO will track musically. Expect variance

across 4 octaves. Get the tuning so it is useful to you, and move on to VCO A (next step).