The M-Vave FM-1 is exactly the kind of device I have a weakness for. I may not have an intended use for the frequency-modulation synthesizer, but when a low price meets a high coolness factor, I’m powerless to keep it out of my cart. Initially billed as a pocket cousin of the famous Yamaha DX7 synthesizer, the FM-1 is a bargain at only $59. 72 after fees…