Here is something for the audiophiles who want to get more from standard audio and put some fun into it. The Gakken Analog Synthesizer SX-150 is a low cost that should improve and perhaps create some spunky audio just the way you want them to be. It is pretty much simple to use and portable as well since you can turn to 4 AA batteries if you want an alternative as far as power source is concerned. Check out the demo video below.
(Source) Japanese Trend Shop