To make it sound like the old nintendo/gameboy music? I tried looking for a bitcrusher dll but it doesn’t work.
You can convert a song to 8 bit easily enough, but it probably won’t sound like the old nintendo/gameboy music.
To convert to 8 bit, select “Other uncompressed files” as the file type in the Export dialog (http://manual.audacityteam.org/o/man/file_export_dialog.html) then click on the “Options” button, and select “WAV (Microsoft)” as the header and “Unsigned 8 bit PCM” as the “Encoding”.
Apart from a bit more hiss, you probably won’t notice much difference between the 8 bit version and the original.
Ah, thanks but as you said it really doesn’t make a difference. Do you know if there is a plug in or effect that can do this?
Have a look at this video tutorial: https://www.youtube.com/watch?v=R82FExdydLM
Also see free ChipTune software musagi … https://www.youtube.com/results?search_query=musagi
Hello
If you really want to get into 8-bit chiptunes. I think the C64 scene is alive and well 
Making a good chip-tune is a task of great skill and persistence, that’s why people post videos on YouTube, not because it was done by a filter. [moderator note highlighted] One of many related web sites: noname.c64.org/csdb
A Google search for “how to make chiptunes” will bring up lots of relevant links.