Grem
Glad you found a work around. I think there is more to it than the TH3 plug, but if that is working for you, keep on using it (or not using it as this case may be!)
Like you, I suspect that it is not just TH3, and I can freeze the track once I have finished recording, but it has put me off it a little. Apparently some people have had success adapting S Gear for use as a bass amp, and I am going to try that next. If I get any joy, I’ll post about it separately.