Dual state-variable filter

Altered States is a dual analog state variable filter in a 20hp module.

The filter cores are based around the clean and reliable 2164 Quad VCA chipset and offers full voltage control
over cutoff frequency and resonance as well as individual outputs for each filter response, including a variable
state output with manual as well as voltage control.

The filters are identical in featureset, the controls and I/O for each filter is as follows:

Frequency cutoff control
Resonance amount control
Variable state control
Frequency cutoff CV attenuverter
Resonance amount CV attenuverter
Input level attenuator with overdrive

Filter input
Frequency cutoff CV input
Frequency cutoff 1V/O scaled input
Resonance amount CV input
Variable state CV input
Variable state output (LP-Notch-HP)
Lowpass output
Bandpass output
Highpass output

Also available are a toggle switches for Combine (links the filter B frequency cutoff controls to filter A), and
serial or parallel input routing.

Altered States is a highly versatile dual filter, the input and resonance controls have plenty of range to dial in
anything from smooth and clean to harsh, overdriven and screaming resonant tones. The cores are very stable and will
give you around 5 octaves of 1V/O tracking sine wave self-oscillation. The state outputs offer seamless fading between
lowpass and highpass filter response, with an all-pass/notch response around 50% of the knob setting. With voltage control
available on frequency cutoff as well as on resonance and state outs, the Altered States is perfectly suited for the modular
environment.

• ? mA +12V
• ? mA -12V
• ? mA 5V
• 45 mm Depth

Module is available as a DIY project only.

This Module is currently available.