Added some detail to a 20 year old bug report that probably like two other people on the planet care about: https://github.com/adplug/adplug/issues/12 Posting here on the very remote chance that anyone reading this has worked with DOS FM synth music formats and/or the ScummVM Adlib sound code.
@jplebreton I was gonna say, I have all these old LAA files, and my impression was that it was the files that were the issue, not the player. VGM dumps of the same tunes play fine, and the games themselves sound good on various emulators, and that was even before the Nuked emulator.
@jplebreton Usually it's DOSBox, and VGM pack author often edit files to get them to be what they see as "ideal" form. Usually there are some tech details in the included txt file.