Yeah, they won't work for what you want. Perhaps the pedal you were referring to in another thread might be an option?
The Tech 21 pedals are supposed to work with a PA or in front of an amp, though only some of them have a speaker emulation defeat switch to work better with a guitar amp. The ones that don't have the switch are much tougher to dial in in front of an amp, so I would look at the ones that do have the switch for that purpose.
Locally available? Yes:
Mr T wrote:
There is a local Tech 21 distributor. He could probably direct you to a store that stocks 'em: www.microdotmusic.com/index.php/tech-21
Give him a call.