I would like to take a music file, and manipulate it, so that one channel plays the music as recorded, but alter the other channel so that it plays the music at 0.3 Hz. higher in frequency. Or just simply alter both channelsIs so that they alternate (back and forth) from the original frequency to the + 0.3 Hz frequency rapidly. Is this possible? What hardware or software would I need? Free or inexpensive software/hardware recommendations would be appreciated.