Tenori-On, the crazy light-up handheld synthesizer from Yamaha we've been geeked about for months, officially launched in the US tonight. It won't be on sale until May 1, but we got our hands on one and simply put, we were amazed. Resident Giz musician Jonny Lam (Brian's little brother) hit the event with us, and was playing music in minutes. What's interesting is how you can play this thing according to sound, but also, visual cues:
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