User Manual
51
VCO CALIBRATION
Your Mother-32 is fully calibrated at the factory before packaging and shipping. Because it is designed to
play with external analog gear, which may or may not be well-calibrated, provisions have been made for
tuning the VCO without opening the unit.
There are 4 small holes in the front panel to access the most important calibrations for the VCO: VCO Offset,
Frequency Control Gain, External 1V/Oct Gain, and KB CV Gain.
A calibration tool has been
included with your Mother-32
in the event that you need
to tune the instrument to
the analog or modular gear
in your setup. Keep in mind
that the internal tuning
trimpots are not designed for
unlimited use. ON LY calibrate
your Mother-32 when it is
absolutely necessary.
NOTE: If you have a lot of
analog gear, you may want
to look into obtaining a
precision voltmeter for
voltage measurements.
WHAT YOU WILL NEED
1. A wide ranging and accurate tuner.
2. The included calibration tool.
3. A 1 V/Octave source (One that is conrmed to be well calibrated - no more than 1 mV error per octave).
CALIBR ATION
1. Make sure your Mother-32 has been powered on for at least 15 minutes, and that it is in a place
where the temperature will not change drastically while performing the calibration.
2. Remove all patch cables from the patchbay.
3. Set the panel settings to a basic sawtooth sound (Page 07).
4. Connect the AUDIO OUT to an accurate, high-quality tuner.
5. Set the VCA MODE to ON.
6. Ensure you are in KB mode with the Record function Off.
7. Set the FREQUENCY control precisely to center position.
8. Make sure the VCO MOD AMOUNT control is turned completely Off.
9. Set the Keyboard Octave to “5” and press low C (Step 1) on the keyboard (KB CV outputs 0V).
10. Verify that the pitch is Middle C (C4 - 261.6Hz). Adjust the VCO Offset trimpot ON LY if necessary.
11. Set the Mother-32 Octave to 7 and play the lowest C (Step 1).
Frequency Control Gain VCO Offset External 1V/Oct Gain
KB CV Gain