MAKE contributor Michael Una posted a review of Highly Liquid’s MD24 kit which converts MIDI events over to an array of 24 +5V outputs –

The new MD24 falls into the latter category. It takes a MIDI input and gives you 24 discrete +5V outputs that can be used to drive relays, transistors, or servo motors. Functionally, the MD24 is similar to HighlyLiquid’s MSA-T or MSA-R kits, except that you now have 24 outputs instead of just 8- a significant improvement.

More over at Create Digital Music.

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Make – Volume 15 – Drumbot Activate!