Both the original Minimoog and the Midi Mini have three oscillators and a reference oscillator producing the standard 440Hz tuning tone.
If you need to tune the instrument, the best advice would be to ditch the internal reference as a long term standard of correct pitch because this might drift, or be adjusted incorrectly.
Instead it is better to use a modern tuning checker and set the VCO tuning directly, or you could tune up the internal reference and use it to reset the VCO tuning during the session because it shouldn't drift over a short period.
For the rear panel adjustments, use a screwdriver with an insulated handle.
With Oscillator 1 on, high A pressed and zero beating with Oscillator 3 (440Hz), switch the Oscillator 1 Range control on the front panel to the 32' foot position and adjust the Octave control on the rear panel for perfect zero beat tuning.
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