Once you have packed up your folding guitar for the next gig, don’t forget to include Infinite Response’s Vax 77 Keyboard. When flat, the instrument is 46.6 x 14.5-inches. Fold it up and it is merely 23.3 x 14.5-inches. The Vax has a 300K flash memory with 100,000 erase cycles, an ADI Blackfin DSP 400 MHz processor, 4 inputs, and midi in/out and USB connectivity. It also features a modulation/volume wheel, octave shift, effects, and navigation arrows. Check with Infinite Response for availability and price.