Used Dunlop Cry Baby Wah 105Q
 
The first wah pedal designed by bass players for bass players. The 105Q incorporates a proprietary potentiometer and custom EQ circuitry specifically optimized for bass frequencies. The Cry Baby Bass Wah applies the wah effect to the mids and highs only, leaving a strong fundamental to hold down the bottom so you can take solos or throw in fills without ever disturbing your low end
 
auto-return switching with circuitry specifically optimized to keep your low end fundamental intact!