I think the device is broken because the sound is really glitchy and absolutely terrible. Will return it.
EDIT: Got sent a replacement. This has a fuzz sound that is, well, okey'ish, especially on powerchords, but unfortunately this unit is, like several of the other ministomp pedals I ordered, extremely noisy. if you only use one device at the time the noise is not too prominent (although once I started spotting it now I hear it all the time) but if you add another high gain ministomp after it, like distortion, then this will amplify the background hiss further to the point where it can't be ignored. these devices don't really work together. which is a shame because that's sort of the idea with these units, no?
seems like Thomann put the money mostly on classy packaging and solid metal casing but skipped on the quality of the electronics. of the four ministomp I ordered only one had what I would refer to as a relatively clean sound, the other three I will be returning.