The March Acid Pattern is by King Mental (http://soundcloud.com/king-mental)
You can grab the pattern data from here
The pattern can then be programmed into your tb303 or x0x box to create a new track.
The pattern could be programmed into your vst such as ABL or Phoscoyn to create a new track.
Transcribe the pattern to midi and send it to your favourite synth to create a new track.
Grab the audio file and rework the audio into a new track