Everything from retro-style axes to interstellar effects and insanely powerful amps caught our eye in Nashville.

The TonewoodAmp combines several effects (delay, reverb, tremolo, auto wah, overdrive), EQ, and MIDI capabilities in a relatively small package that attaches to the back of the acoustic guitar via magnets. The amp "excites" the body of the guitar and the effects come through the soundhole along with the natural tone of the guitar. It will be available in September for $199.