Environmental chance, expectation and also more likely the playing of different tracks that have an entirely different quality of production and mastering? I imagine Richard wouldn't have been playing the same track over.

As I've listen to MQA on a few occassions I am impressed but also quite clear that even with MQA I DON'T enjoy some tracks any more or less than I did pre-MQA. The opposite may be true for Dappad for any particular track. i.e. the coincidence of changing 'whatever' but also hitting a track that 'ticked all his boxes'.

Rgds,
Nick