AC-90: Recommended Foot Switch June 27, 2014 16:51 Updated The following are compatible footswitches for the AC-90: Boss FS-5U BOSS FS-5L (Mute On/Off) BOSS FS-6 Related articles BOSS FOOT SWITCH PEDALS: FS-5U, FS-5L, FS-6 and FS-7 AC-60: Recommended Foot Switch ACS-PRO/LIVE: Foot Switch Options & Functions AC-90: Speaker Stand Mount Diameter: 1-1/2" inches GT-100: How to Bypass All Effects and Modeling