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The oscillator Bit features a "pitch" knob to adjust its output tone and a "tune" dial for adjusting the tuning when using with the keyboard. It also features a mode switch that selects between "square" and "saw" waveforms. The "square" waveform has a rich, powerful character, and the "saw" waveform has a more mellow, rounder character.
You'll often use it after the keyboard or micro sequencer Bits, but you can have lots of fun by just twisting the pitch knob and "sweeping" through all the frequencies from high to low pitches.