These opcodes come mostly from Perry Cook, and are a special case
because they all rely on a couple of modules that by themselves don't
implement any opcodes and also can't be justified for inclusion in the
main sound engine. So, we can't use the 1-object-per-opcode rule here.

Instead, we build an actual shared library of everything here, and
make-opcode-map will do the right thing when we build the opcode-map.

--pbd
