Looking to buy, and this seems to be in my price range:
http://www.noisechannel.org/products/arduinoboy-blue
Any pros/cons with it? Does it work properly with mGB/LSDj?
(I don't know much about the nitty gritty of the hardware aspects of chipmusic)
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It's built by NeX, an d it should work with everything. Pay attention to the cable connector to see if you should really use a DMG or a CGB or pocket 
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Playboy Man-Baby
I guess I'm just paranoid about glitches/latency stuff before buying.
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United Kingdom
I had one of these made by Nex last year. Exactly the same style it works great with my midis port 2x2x.
Haven't tried it for much else other than midi sync. Nex is an awesome dude, I'm sure if there's a problem with the device he could talk you through it.