Some time ago I was wanting to get my Alesis Quadraverb GT back into regular use in my guitar rig. There were a lot of old patches in it and I thought I would need to program a few more.
I remembered the Studio Module feature in Cubase 5 (which I'm still using) and looked around the Web for a driver for a Quadraverb GT. I didn't find one but did turn up something for the original Quadraverb. I thought it would be a straightforward process to tweak its settings for the different Sysex dump layout of the 'GT - well, yes and no.
To cut a long story short, after a couple of days of often frustrating near-misses I got what I think is a correct driver definition, so for anyone who has a Quadraverb GT and is still running Cubase circa 2001, the definition file (*.d) and binary file (*.dev) can be downloaded from the links below.
If you try it and have problems, I must warn you that you could be on your own, no liability is offered or accepted! However I would be interested to know how you get on.