AMPS is designed to be compatible with all different SMPS sound engines to a reasonable extent, so any music can be ported nearly perfectly! This ROM hack provides custom music edits on top of the Sonic 3 & Knuckles and Sonic 3D sound tracks. AMPS is based on SMPS sound engines (Sonic games use different variations of SMPS), but improves upon them.
AMPS provides very clean sample playback on the Mega Drive, courtesy of the Dual PCM sample driver. AMPS is a sound engine designed to have a lot of useful features, fix bugs and do it while being less demanding on the hardware. AMPS in Sonic 3 & Knuckles is more or less what the title says: I've added AMPS to Sonic 3 & Knuckles.