Just wondering, are there many circuits for acoustic guitars I have a friend who plays and his birthday is coming up, his normal set up is guitar into di into mixer.
Thinking maybe a chorus, reverb but open to suggestions?
Chorus and reverb should be ok. Why not a tremolo? I think it would be cool. A compressor could be useful, too.
;)
Would a pedal designed for electric guitars work or is the signal from acoustic any different
"Exciters" have been used since the late 1970's (starting with the Aphex unit) to give an extra brilliance to acoustic guitars. Any recording where your first thought was "my guitar doesn't even sound that bright with new strings right out of the package! How are they doing that?" was most likely using an exciter of some kind.
There are different ways of adding that super-airy top end. Jules Ryckebusch's "Harmonic Sweetener" project that appeared in Electronic Musician many years back demonstrates one way. A 2-stage (4-pole) highpass filter, in the lower left-hand corner separates the upper mids and highs, which are then clipped by the LEDs to add more harmonics. That content is then mixed into the original signal, via that 10k pot. It can be a little hissy, but it works well. The layout shown below indicates it is untested.
(http://www.montagar.com/~patj/harmswtn.gif)
(http://torus.untergrund.net/sweet/harmonicsweetener.gif)
Just to give you an idea of the possible, here's Monty Montgomery's pedal board...
(http://i142.photobucket.com/albums/r85/krbentley/Transcriptions/Montysboard.jpg) (http://s142.photobucket.com/user/krbentley/media/Transcriptions/Montysboard.jpg.html)
I really like the amz mosfet boost with my acoustic. Doesn't change your tone, just gives you more volume when you need it.