Because when I have opened my Renoise, then I can only adjust between 8 and 16 bit as lowest?
Why don’t you just bitcrush it non-destructively, or alternatively bitcrush it and render it to sample and use that? A lot of the “crunchy” sound comes from poor quality D/A conversion anyway.
Use lofimat effect, and if you want/need it you can render it with the effect on, even though the sample will be 44.1/16(or whatever bitrate/depth you choose) it will have 12 bits of sample information. Unless you choose 8 bit obviously
edit: ahh too slow