Playing digitized sound files on the HP48G/GX

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You remember right, I downloaded it at some point and disassembled it. It seemed to be a pretty simple ARM assembly loop actually. I think it was something like: put a byte at some specific memory location, wait some time, repeat with the next byte. I may be off though, because that was before I started to mess with HPGCC3, which I did several years ago...
Here's the link (took a few minutes to find because I couldn't even remember the exact name...): Open Fire Sound Check
Along the way I found these: Piano, SFX Lib, JSBACH. The first two are labeled as 49G+ / 50G-only, the third has different versions for the 49G and 49G+ / 50G. All of this suggests some ARM system interaction. I didn't look into them yet, though.