This ROM sample should fade out, but it doesn't in openMSX.
To easily test:
1) start mbwave
2) go to instrument menu (F3) and select the "Applause B" sound for instrument 1
3) press M to play the sound and keep the key pressed
4) on real MSX, the sound will fade out after a while, in openMSX it does not. Here is what happens on real hardware: http://meits.nl/files/msx/applause.wav
Reported by Meits.