OK, thanks all. Some very practical suggestions there. Had my first play with Reaper and not sure really. Could only adjust volumes, and panning, but didn't delve into eq or effects. Also couldn't see how to master and boost, so just saved a live on the fly mix. Lowered the volume, raised the drums and bass in the mix. Sounds a bit muddy to me overall but that could be because it's lacking eq and mastering flourishes. Added the second mix to the original post, below the first one.