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Tuning
There are many parameters that affect tuning in VO-1. Tuning is a very important factor in
achieving an analog sound.
Glide Rate, also known as portamento, adjusts how quickly the
oscillator pitch changes to a new note. Turning the Glide Rate up
makes the pitch transition smoothly between notes.
Both oscillators have a frequency control for adjusting their pitch.
Detuning notes by semitones can create chords. Fine adjustments of
these knobs can widen or fatten the sound of a patch. Note that the
programmer area contains buttons for fine or coarse control.
Drift simulates the instability analog oscillators have in their frequency.
Even when the tuning trim pots have been set very accurately, the
oscillator frequency of an analog oscillator drifts slightly up and down at
a slow rate, causing it to be slightly out of tune. Turning this control
down will fix the frequency at an exact rate. Turning it up magnifies the
effect.
Stretch
Keyboard Stretch adjusts the tuning of the keyboard notes. Normally,
each key is one semitone apart. Analog keyboards often go out of tune,
and the keyboard spacing is no longer one semitone. The note spacing
can be adjusted from 0.98 semitones to 1.02 semitones. C5 is at the
center while the rest of the notes become detuned. If you don’t want C5
to be in tune, you can adjust the frequency with the frequency knob.
