That's pretty much why I haven't peeled it out of the box yet
I have multiple cards with authentic OPL2 chips in use, as well as a selfmade high quality stereo covox (incorporating superior DAC chips compared to the SoundMaster II) ... and I have severe doubts the recording feature is worth anything compared to today's hardware.
CMS pretty much is an ear-grinder
(says the guy who's been into homecomputers with soundchips of pretty much any quality possible) I've only used mine with MI2 for testing so far. If there are requests for recordings, give me a ring.