yeah it's kinda tricky, it has to be done in the oscillator 2 section, select sample where it say phas osc, and model. make sure everything else is turned off and that oscillator 2 is being routed to the output section and not the filter section. There is a little red button just outside the upper right hand corner of the osc 2 section when you click on it, it turns grey, that means it going straight to the output section so you can here the original sample. You can also drag audio files straight intio the sample window in the osc 2 section.