Compute!'s Sidplayer — a C64 note format with its own player, not a SID-chip
dump. A stereo tune is a .mus (voices 1–3) plus a .str companion (voices
4–6), which the plugin loads together.
Extensions: .mus .str
ChipMachinePlus only (see LEGAL-PLUS). VICE is
GPL and ships Commodore's copyrighted KERNAL / BASIC / chargen ROM images.
The Mac App Store build plays the same ~6.5k songs through the clean-room musplugin, which is registered after this plugin — so the Plus build's routing is unchanged and keeps using VICE.
VICE is also no longer the .sid engine in either build; see
csidplugin.
The bridge targets VICE 3.10 (external/vice310/). The bridge API is only
valid up to VICE 3.1-era internals; the 3.10 migration required reentrant
state_* handling.