Anyone here familiar with FMSX-DOS?

I’ve got a few problems the readme doesn’t address…

The sound quality on any games it runs is absolutely horrible. The readme has a few notes on command entries to change the quality, but I dunno what does what or how to enter them once emulation has started. The readme also gives 3-4 tips on how to speed up slow games… but all of mine run way too FAST, and it says nothing on how to slow them down. The site I got it from just says how to run the ROMs, and has no information like this.

Halp? I want my proper-quality proper-speed Vampire Killer back. ;_;