
The Dual SeM20 from Bubblesound Instruments is a dual multimode filter with complex signal routing and a creamy background sound. The four audio inputs can each be routed to filter one, two or both. The filters are constructed in the same way, beside controls for cutoff and resonance there are two attenuators for the CV inputs and a control for the notch balance; so you can manually fade from LP to BP to HP with all variants in between.
In single mode, each filter behaves individually based on the settings made, in dual mode all controls of filter two follow the first. In addition, you can use Offset to specify a cutoff variant for filter one. The design of the filter allows for stereo applications and/or variants with ease. With 1-2 cables and corresponding input routing, the Dual SeM20 acts like an MS-20, but with the wonderfully creamy sound of an SEM synthesizer.
Bubblesound Instruments Dual SeM20