CALIBRATION Switch on and wait 15 minutes for tuning... and hope. I had to do oscillator tuning calibration a couple of time.
Well, ok it's analog, but we are in another century.
PROCEDURE FROM MANUAL: The MODEL D synthesizer can be calibrated and checked occasionally to ensure
that it is operating at peak perfomance. Analog circuitry can drift off with time
and temperature, and as components age. The main printed circuit board (PCB) of the MODEL D has various test points and miniature potentiometers (trimpots) that allow the various calibration and
adjustment procedures to be carried out. This involves lifting up the front panel
to allow access to the bottom side of the PCB.
Three main calibrations can be carried out:
1. The PITCH CV can be calibrated using a computer to send a SysEx command,
an external keyboard, and a digital DC voltmeter. See section 5.2
2. The oscillators can be calibrated using the internally-generated A-440
concert pitch, and an external keyboard
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