http://www.sonuus.com/products_g2m.html
Here is Robert Randolph on the Sonuus G2M pitch-to-MIDI converter at the Peterson/Sonuus booth at NAMM 2014.
Low latency, great tracking -- it really works! Just plug it in your MIDI module and you're set to go. For more information, go to: http://www.sonuus.com
Buy direct at: http://shop.sonuus.com/product_info.php?cPath=23&products_id=31