I'm reading the Roland Cube 60 manual. It says you can use a Boss FS-5U as a footswitch to change channel and to activate/deactivate some effects. But, isn't the FS-5U a nonlatching pedal? If I want to use the Lead channel I have to keep my foot on pedal all the time?

Isn't better a Boss FS-5L (latching)?
nah, itll be that the channel changes when a connection is made, and it'll stay on til its made again. get teh non latching, your SS amp is basically a computer, its not like a tube amp where the footswitch kicks in a whole new circuit itself

hope that makes sense
Get off this damn forum and play your damn guitar.