GearVideo Sep 24, 2025

Feedback Fight! Umbra Takes on Dark Matter

In this video we compare Isobar’s Umbra, a powerful stereo feedback accumulator, with Bastl’s Dark Matter, the cult-favorite feedback and distortion module, to see how each shapes sound in a Eurorack system. This head-to-head demo explores their strengths and differences. This comparison will help you decide which feedback module is right for your setup.