What would happen if you played a software cassete on a tape recorder?

As I recall, there was a command that would push the speaker cone out, and another to pull it back in (probably the ones you mentioned). Sticking a FOR/NEXT loop in between as a delay controlled the frequency.
At it’s slowest setting, it made a clicking sound. Shortening the FOR/NEXT loop turned the clicking into something that sounded (to me) like a helicopter. Making it really short turned it into a humming sound.
I never played music with it, as just making the helicopter sound was cool enough for me. But I did learn a lot about how sound works, so that I now sort of understand how a tesla coil can play music: anything that makes a clicking sound (like thunder) could play music if you can control the frequency.