The HPD-15 contains a multi-effect unit that can add various effects to a sound.

1. Press MULTI-EFFECTS - its button will light when multi-effects are turned on.

2. Press EDIT.

3. Press the PARAMETER RIGHT button until the screen displays MULTI-FX Type.

4. Turn the PATCH/VALUE dial to select a different multi-effect.

5. Play one of the pads to hear the new effect.