Erica Synths Black Double Bass is unique module that combines two transistor suboscillators (-1 and -2 octaves) and lowpass filter.
https://www.ericasynths.lv/shop/eurorack-modules/by-series/black-series/black-double-bass/
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Selling this sweet module. I am moving toward only using my moog grandmother, but for the last few months, I had this module to add some special thumping bass to the bottom of the grandmother. I put four eurorack screws and one eurorack cable in the box with the module because I won't need them anymore. Thanks for considering purchase!
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