Thanks for that dermichl.
Being a typical bloke I don’t read instructions, I don’t follow tutorials, I just press lots of buttons and get in a right cuffuffle 
I thought I wanted to record a midi track on cb while playing it on thumbjam, when in truth all I needed to do was open up a new AUDIO track in cb select audiobus then thumbjam in the INPUT, go to thumbjam, and record from there…oh oh so simple yep.
It’s all a learning process, and after watching quite a few YouTube tutorials, I’ve realised I should have done that right from the word go