Muahaha CS Filter

Based on the original Yamaha CS-80 filter design.

The Stoel Music Systems Muahaha CS Filter provides the timeless filter sound of the CS series synthesizers in Eurorack format. This module uses the original IG00156 VCF chip, which was used in the CS-80, CS-60, CS-50, CS-15, and many others. The module features lowpass, bandpass, and highpass modes on individual output jacks. In addition, there is CV control over the frequency and resonance. The IG00156 is a very scarce, out-of-production part, so the module uses a special ZIF (zero insertion force) socket for this chip. This prevents damage from pressing a used chip with some solder remaining on the pins into a normal chip socket or heat damage from soldering. To install the chip, lift the lever on the socket to the vertical position, set it into the socket, then lower the lever until it latches. The notch on the chip goes towards the socket handle.

With the scarcity of the original IG00156 chips available, these modules are offered in limited quantities.

https://www.stoelmusicsystems.com/eurorack/muahaha-cs-filter