The largest section of ODC's front panel is devoted to the rest of the audio chain after the VCO waveforms are selected and modulated. In this section, we take the VCO outputs through:
The Audio Mixer, where their relative levels are set and modulated
The Voltage Controlled Filter (VCF), where their frequency response (timbre) is modulated
The High Pass Filter (HPF), a second variable filter for further tonal shaping
The Voltage Controlled Amplifier (VCA), which controls overall signal level over time.