Sonification

The process of producing audible sounds as representations of a numerical data set or visual image:
Sequencer -> Midi Packets -> Synthesizer (hardware or software)

Wave File Collections:

Algorithmic Arts - SoftStep MIDI Step Sequencer
http://www.geneticmusic.com/

Au Reality - Building Blocks
http://www.midiworld.org/AuReality

MIDI OX All Purpose MIDI Utility - Monitor, MidiYoke Cables, Hubi's Loopback Driver
http://www.midiox.com

Steinberg Media Technologies
http://www.steinberg.net

Download.com - Audiomulch
http://download.cnet.com/downloads/0-1896426-100-3954350.html

The Sonic Spot - Audiomulch
http://www.sonicspot.com/audiomulch/audiomulch.html

Native Instruments - Reaktor
http://www.nativeinstruments.de

VAZ Modular?