Renoise is a contemporary digital audio workstation (DAW) based upon the heritage and development of tracker software. Its primary use is the composition of music using samples (in WAV, AIFF, FLAC, Ogg, and MP3 format), and MIDI sequencing of VSTi soft synths.
I'm very active in the Renoise community, whatever that means. I initiated the XRNS-PHP Project several months ago, post regularly in the Renoise forums, and absolutely love this music sequencer.
Give it a try, the demo is free, maybe it's for you too?