I'm the lead guitarist in my band and we've always felt that our sound is unique in the way it's centered around one guitarist and we're very happy with the size of our band, we'd feel another guitarist would weigh us down too much.

But recently i've written some music that just isn't good without a second guitarist/other middle toned instrument. we were considering getting another guitarist but the idea of a station/synth that could do playback instead of that is much more preferred.

should we do that? prerecord some guitar rythme tracks and play them back during the live song or is another guitarist a better idea?

and if the playback station is best, what would be best to use?
i know about loop stations but i need something that can have multiple tracks prerecorded and can be activated fairly easily while i play guitar.

any help is appreciated.