Hi!
Sorry for resurrecting this thread, but 7 years later I actually managed to find a copy of Soundrace and I've uploaded it to archive.org, you can get it here:
https://archive.org/details/soundrace_1995
It turned out to be a German promotional game for FUJI cassettes and it's pretty obscure with virtually no mention of it anywhere online, so it might be a fun curiosity for anyone who's interested, or if anyone would be eventually interested to host it on Abandonia as well? In any case, just posting this message here in case anyone else turns out searching for this game so they might find it a bit easier.