Q: Where can I find the manual for my Line 6 controller? A: Instructions on how to use your FBV controller can be found in the back of your specific amplifier's user manual. See the link below. user manual . Q: Which Line 6 controller works with which device? A: Please see the chart for more information on which controller will function with each Line 6 device.   FBV compatibility chart   Q: How do I engage the Wah? A: To engage the wah, simply press toe down on t