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Use the attachment system in the stead of links, it makes it easier for everyone who's just woken up and doesn't want to deal with highlighting this early in the afternoon. Also, the files will remain accessible as long as the thread is accessible, so it makes more sense.
I am not able to reproduce your problem. Here are my exact steps
1. Doubleclick instrument03
2. Go to DPCM tab of instrument editor
3. Assign Kirby$FCC0 to dmc note C-3
4. Close instrument editor
5. Press spacebar to change to editmode
6. Place C-3 in dpcm column
7. Press play and sound plays