So you bought a ID amp and need a footswitch (FS) for you amp and shied off because of the price. Well to access more that the 12 patches via amp you need the FS-10 to access 128 patches w/o connecting to you computer via Insider. It is the reason you bought this amp to eliminate pedals, wires, power supplies. An all encompassing tool for practice to save hassle or space.
With the FS-10 you can edit patches, read the amp's tuner better with the LED readout, and turn on/off individual effect through the FS. Has a Tap switch for syncing rhythm with delays.
The is no latency however, the FS will not engage to new patch until the foot as released the switch; which can take a little getting use to.... like riding the clutch. This is not your standard A/B switch and Std. A/B switches will not work with you ID amp.