Music Mixers DarkBLENDZ - description from Softdepia.com:
Interactive music mixers allow the user to manipulate sound samples and sound loops that can be mixed and matched to create a song. There are many different categories of music mixers. Each category contains sound samples of that music genre. Each mixer contains between 40-66 sound loops that you can play. Making music has never been easier with a CyberMixer at your fingertips. You can devise hundreds of songs from one mixer. The combinations of sound loops are endless. WARNING: may cause serious loss of free time.
Music Mixers DarkBLENDZ is a "Free to try" program. You can download and try it for an evaluation period.