Check the listing for details. Silktone Expander Pedal. Condition: New. Listed at 269.00 USD. The Silktone Expander Pedal is for players who want one drive pedal to do a little bit of everything- subtle harmonic thickening, gritty overdrive, chewy fuzz, and everything in between. The three-way Voice switch dials in high-end response to suit your rig and playing style, whether you're stacking pedals or just plugging straight into an amp.