InstaCue provides instantaneous professional music playback, and is much less expensive than instant replay hardware boxes.
InstaCue plays clips instantly, in any order, and lets you build playlists and store them for future use. You can even layer multiple clips simultaneously. Clips and Panels (a grouping of clips) can easily be reordered via drag and drop.
Plays m4a, mp3, aac, aiff, au, wav, snd, amr, Apple Lossless, Core Audio Format, MACE, PCM and MS ADPCM file types, as well as others with additional QuickTime components.