As a starting point to learn about lua scripting for Renoise, I used the tool Guru to make control definitions/gui's for mGB.  I've tested these a lot but I'm still not super knowledgeable about mGB so there could be things that don't work like they're supposed to or that I missed all together.  If you're a Renoise user and have the gear to run mGB you can check these out and do some beta testing for me. 

First, get Renoise (demo is free):  http://renoise.com

Then get the Guru tool from here (to install just drag the downloaded file onto an open Renoise window and follow the prompts): http://www.renoise.com/tools/guru

Finally, grab the mGB definitions and drop them in your Renoise install folder at ...Scripts\Tools\com.cornbeast.Guru.xrnx\synthdefinitions

Defs are here: https://www.dropbox.com/sh/fbiaoavdjfzq … b3BMi5xZDa

Some notes: all displayed values are in decimal (not hex), there are 5 definitions since Guru can't use multiple midi channels at the same time, the first time you open each definition you'll need to set your midi out device and the proper midi channel, there's not much that can be changed about the way the window looks other than it's height so i've tried to group things in a way that looks sort of symetric and not too ugly