SCC and SCC+ isn't working on some A&L ports of KonamiGameCollection's KnightMare and Twinbee. The games run fine, but without any SCC/SCC+ sound at all.
OTOH, Knightmare SCC is working fine with SCC sound:
You can get these versions for testing here:
openMSX-0.8.0+NekoLauncher v1.2 (-romtype auto)
Mac OS-X v10.6.4
Note: Twinbee SCC also didn't had SCC sound even if I force the romtype to KonamiSCC.