Overloud TH-U and Orange Tree Samples (OTS)

[EvilDave1025]

I have quite an extensive library of OTS.
I recently purchased and FCB1010 pedal and Overloud TH-U.
The sounds in TH-U are a welcome addition to OTS.
I have had little success with figuring out how to change amp presets within TH-U via the FCB1010.
Currently I am using TH-U within Studio One 5 (SO5) and I am able to program commands such as delay on off and delay amount linked to the expression pedal.
I am doing this via midi learn within SO5 but since hovering over a preset does not show it as an option to link I have not been able to associate it with a pedal command.
Overload support is frustrating me as the only way I can possibly achieve this is through the midi learn within their program however this is not responding to midi learn command.
Hopefully someone can guide me in the right direction.
Thanks. Evil Dave