FL Studio 8
FL Studio is the most complete virtual studio currently available. It will play any sample file (wav), generator (softsynth), VSTi & DXi) or midi instrument you feed it.
FL Studio can be used as a scratchpad for your ideas or to produce completely mastered tracks ready for publication.
The demo version does not allow you to save your project, but does include all of the program’s features. You can even test the rendering to wav, midi & mp3 options, or produce gigabytes of loops and songs for free.
Download: FL Studio 8 Windows Me/2000/XP/Vista