These look like loads of fun!

Volca Keys is a simple but supposedly powerful polyphonic analogue synth with loop sequencer; Volca Bass is a 3-oscillator analogue bass synth with an Electribe-inspired 16-step sequencer; and Volca Beats features analogue drum sounds inspired by classic rhythm machines and a 16-step sequencer.

Each of the instruments features MIDI IN – something that was sadly lacking on Korg's previous pint-sized synth offerings - and sync jacks. The Volcas can be battery powered and come with built-in speakers. They can be used individually or in combination.

Best of all, we hear that each Volca is set to sell for $150, which leads us to suspect that these things are going to fly off the shelves.

http://www.musicradar.com/news/tech/musikmesse-2013-korg-volca-analogue-grooveboxes-unveiled-573584