The SoundForce Dual Filter is a 2-stage cascaded OTA design based on the late MS-20. The design has been fine-tuned with extended resonance control as well as a resonance CV input. Each filter can be either a 12dB/oct low-pass or 6dB/oct high-pass. To keep the module HPs on the low side, the filter mode setting is located on the back of the module. The module was designed to be a very affordable full-featured modern filter.
Highly efficient design:
This design attracted me very particularly due to its beautiful simplicity. With only 2 poles, it uses a total of 3 OTA ICs and 4 OP-AMP ICs for both filters even with the added resonance voltage control. Early on, efficiency and part counts were a focus during testing and development. In combination with automated manufacturing and a very short supply chain, the module has a very high quality standard at a very affordable price. The module uses only A-brand ICs and passive and no costs were cut during purchasing.
Price and availability:
It’s available right now to order at 149 euros (123 euros outside of Europe) on the SoundForce webshop, Signal Sounds and Mattech Modular. Please note that the module is not yet in stock at Perfect Circuit Audio, but I recommend customers to ask them about it.