The Stoel Music Systems Norton Filter is a 24db/octave voltage-controlled lowpass filter based on the later versions of the ARP 2600 filter. It uses a peculiar type of amplifier device...

The Stoel Music Systems Discrete VCF is a vintage-inspired voltage-controlled filter that uses several matched transistor pairs arranged in two sequential filter blocks. It sounds completely different from the famous...

The Stoel Music Systems 2044 Filter is a classic 24db/octave analog lowpass filter with voltage control over frequency and resonance. The 2044 filter was used in the Korg Polysix, Korg...