Join Merge, Combine Multiple MP4 Files Into One Software 7.0 Overview

Play MP3s slowly by adjusting tempo. Also, adjust pitch to make slow playback more listenable.

Soft4Boost Suite - a package consisting of Soft4Boost programs all-in-one: system utilities, audio, video, image and burning software. Subscribe for $24.95/year or $39.95/lifetime.

Abominaclavia is a bizarre drum machine-like sequencer that lets you assign audio files to 128 separate beats each with its own controls for pitch, volume, and stereo panning.