My iPad mini is a great little synthesizer. That's not a very big market, though. For about $400 (total - iPad + Casio, some wires and software), you can use

My iPad mini is a great little synthesizer. That's not a very big market, though. For about $400 (total - iPad + Casio, some wires and software), you can use one to build a portable rig that actually sounds decent (if only I knew how to play better...). Use a "camera kit" (USB hub) to run MIDI in through USB, and an aux cable to run the sound back through something like a Casio keyboard (disabling the Casio's internal noise maker). Start up one of the inexpensive but pretty good synth programs on the iPad and go to it. (A cheap Casio lacks controller knobs, but you can use the tablet touch screen for expression) Audio latency on Android is generally too sluggish. Have not tried ChromeOS, but I expect it's similar. Plus, the guys that make the synth programs expect to get paid $5, $10 or $20 (depending), so I don't see this stuff moving over to one of Google's environments, where everybody expects vendors to provide free apps.