Many electric guitar effects don't sound real good with a saddle pickup input, but if it's only occassional you could make do with a Boss Blues Driver, or any one of their other units. If you're using a soundhole pickup they'll sound better, imho.

Lately I've been using a Digitech RP200 multi-effects unit. It was cheap, is easy to program, and durable. One of these sort of units will allow you to tinker with the signal more, give you lots of sounds you don't need while being very versatile with delays, reverb, chorus, etc, some of which some acoustic players enjoy.

Caution: Guitar signal quality and source will change the quality of the effect drastically. The factory presets on multi-effects pedals are generic in the extreme and designed for solidbodies (it seems), so you will need to program your own settings.

Zoom, Boss, Digitech...stay with the established names.

Hope this helps.

Peace, Mooh.