DrumSynth builds sounds out of swept-frequency sine waves, noise bands, pink and white noise and complex waveforms. It can reproduce sounds from classic analogue drum machines and make entirely new drums, pitched sounds and sound effects! 

Example sounds (83k .mp3)
 

Make sure that you "Use Folder Names" when unzipping to expand each kit into a subdirectory. DrumSynth requires Windows 95 / 98 / 2000 / NT and needs msvbvm50.dll in your \windows\system folder (you probably have it already).