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Dasz Instruments Alex is an expandable hardware synthesizer and controller concept. Its focus is to simplify, unify, and broaden your creative workflow, freeing you to focus on your music rather than your setup.
In the Alex system you start with a main module which gives you four tracks of instruments, mixer, effects, a looper and a step sequencer. If you need more tracks then you simply add another module.
Each module contains a built in DSP chip, but this can be expanded if you need more juice.
The Alex system is also a comprehensive controller for your external gear, with MIDI outs, and also CV i/o with the CV board expansion.
More info at Dasz.com
Using Chains and automation to switch keyboard setups
Gaz Williams has one and he brought it round