I have just been working on a GT-100 bass patch set, which you can download from
http://sourceforge.net/projects/fxfloorboard/files/GT-100FxFloorboard/Patch Sets/
If you would like to try and let me know what you think of them and if any need tweaking..
Thanks for putting together these patches! Am going to give them a try. I'm partial to the Ampeg SVT modeling on the GT-10B, so if any of these deliver a similar tone and the tuner doesn't give me issues with low strings, I may stick with the GT-100 for both bass/guitar and sell the GT-10B.