this patch will only work with a pedal, because for normal play, the pedal needs to be in the toe up position...effectively bypassing the pitch block and the compressor. when you hold a sustained note, you push the pedal slowly down and this mixes in the pitch and compressor to sustain the note and add harmonic content.
So, if you wanted to create a sustainer effect with no feedback, would you just use the compressor with the same settings and no pitch block added?