The ES07 is a 2-pole state-variable filter with 12dB/octave slopes on the [LOWPASS] and [HIGHPASS] outputs and a 6dB/octave slope on the [BANDPASS] output.

The ES07 does not self oscillate. By turning up the [Q] resonance control, the filter can used as a percussion sound generator - xylophone, wood block, drum, bell, gong, vibraphone. It does not have a 1V/Octave input but does have a scalable [FC CV] input, so can be adjusted to track to play tunes, etc.

Doug Lynner compares the ES07 with the original 1973 VCF

Build Guide