Like most older synthesizers, the frequency of the oscillator is adjusted by a 'control voltage.' In the case of the Chroma, this voltage is under control of the embedded processor. Tuning Quirks – Oscillator Linearity and Auto-Tune Repeatability.We take it for granted that somehow the tuning gets done - but have you ever wondered exactly what it is doing? The auto-tune doesn't have 'ears' like we do.
The Chroma tunes both the oscillators and the filters in a channel. This is not just a meaningless light show - each flash actually represents one of the 16 channels being tuned. We're all familiar with the flashing LEDs as the Chroma starts up. Unlike older analog keyboards that required manual adjustment and tuning of the voices via multiple potentiometers per voice, all tuning in the Chroma is done under the direction of the computer.
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