Irem's R-Type, a fine shooter regarded by some MSXers as a cheap Gradius ripoff, originally only sang MSX-MUSIC if it detected an FM-PAC cartridge. A fix for this peculiarity is already floating around on the internet, though not without its bugs.
Today, BiFi (not active on our forum anymore), released an additional ROM image that's able to make R-Type detect MSX-MUSIC. It also allows the user to boot with PSG or MSX-MUSIC, and MSX1 or MSX2 graphics via a menu. Like FIXBOOT, it can be obtained from BiFi's website, in the Downloads section, under Bugfixes.
Relevant link: BiFi's Home Page

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