A synthesizer played by pumping energy into it: https://www.youtube.com/watch?v=huYJa2Du57g https://www.youtube.com/watch?v=huYJa2Du57g Because the volume sho

A synthesizer played by pumping energy into it: https://www.youtube.com/watch?v=huYJa2Du57g https://www.youtube.com/watch?v=huYJa2Du57g Because the volume should track how hard you play and stopping to change/recharge batteries takes away the fun!