The Q107 Filter changes the harmonic content of signals to create new, interesting sounds. This removal of harmonics is the basis of subtractive synthesis. Both the cutoff frequency and the resonance (Q) of the filter can be controlled manually and/or controlled by another signal such as an envelope generator, oscillator, keyboard, etc. Control signals can be attenuated and inverted. Low Pass, Band Pass, Notch (Band Reject), and High Pass responses are provided simultaneously.

Extended information

Controls and Connectors:
There are 4 sections (listed top to bottom)
- Frequency Control Section
- Resonance Control Section
- Signal Input Section
- Output Section

Frequency Control Section
Frequency Control
Manually controls the filter's cutoff frequency. Frequency Level Control
Allows inversion and attenuation of the cutoff frequency control input. Frequency Control Input
Voltage control of the filter's cutoff frequency. 1 Volt/Octave Frequency Control Input
Voltage control of the filter's cutoff frequency at a fixed 1V/Octave. Normally used to track the keyboard.

Resonance Control Section
Resonance Control
Manual control of the filter's resonance. Resonance Level Control
Allows inversion and attenuation of the resonance control input. Resonance Control Input
Voltage control of the filter's resonance.

Signal Input Section
Signal Input
Signal Input at full amplitude. Signal Input - Adjustable
Signal Input which is adjustable with the level control. Signal Input Level Control
Allows attenuation of the adjustable input signal.

Output Section
High Pass Output
Filtered output signal where low frequencies are attenuated. Band Pass Output
Filtered output signal where a frequencies on either side of a narrow band are attenuated. Notch Output (Band Reject)
Filtered output signal where a frequencies in a narrow band are attenuated. Low Pass Output
Filtered output signal where high frequencies are attenuated.

Technical specifications

Specifications:
Panel Size: Dual width 4.25"w x 8.75"h.
Low Pass, High Pass Slope: -12dB/Oct.
Band Pass, Notch Slope: -6dB/Oct.
Cutoff Frequency: 1/V per Octave and adjustable.
Resonance (Q): 1 to self-oscillation.
Frequency Range: 20hz to 20khz.
Power: +15V@20ma, -15V@20ma.
Waveform Levels: 10V PP.