Lloyd, you're a bloody genius..!! grin
Thank you for these suggestions.
I'll try them tonight.

I'm running 2015 BIAB Pro, but may upgrade this month to 2017.
I have RealTracks Set 8 - Country Folk
RealTracks Set 11 - All Bluegrass (Rhythm)
RealTracks Set 12 - All Bluegrass (Solos)
Styles Set 17 - Unplugged
RealTracks Set 33 - Bluegrass Medium Tempo

I would like to use BIAB for back-up tracks to improve my timing on fiddle tunes.
I also have a number of MIDI files for Celtic tunes.

Your further advice appreciated especially if you perhaps think I should upgrade the 2017 package to Mega or perhaps get some further RealTracks. My needs are modest..!!

Thanks.