Well, these new itty-bitty analogue synthesisers from Korg are just so cute I want to gobble them up. From the demo video above, it sounds like the three Volca series keyboards are lovely little groove machines you might want to use too.
The synthesisers come in three Volca flavours: Keys (for leads), Bass (for bass lines, duh) and Beats (a drum machine). Pick the one that suits your style or patch them together into a neat little music assembly line like so:
The synths both make the funky sounds and have built-in 16-step sequencers so you can use them to make simple beats on the fly.
At 7.61 inches x 4.54 inches each of the synths is smaller than an Apple bluetooth keyboard, they each weigh less than 500g, and they're powered by six AA batteries. For $US150, these bundles of beats might be hard to resist. [Korg]