Nintendo NES SYSTEM FAQ:
Q: Why I can not hear the samples in the emulator/player?.
A: Some NES emulators do not support RAW PCM Samples, DefleMask uses this way of sample playback because it is more powerful but more CPU expensive too.
Q: The NSFs of DefleMask can be played on a real NES?.
A: Yes, the NSFs were tested on a PowerPak and everything works fine.