Hi Mike,
Just to add what you probably already know.
The tracks should sound level at the volumes they will be used at. Nothing worse than a BT that sounds fine when trying not to disturb the neighbours, but the bass causes heart palpitations or the treble slices your ears off when cranked up.
Some digital processing algorithms take this "perceived loudness" into account, but really if you want accuracy it does need human ear intervention. (and not aurally challenged ones at that !)
cheers
George


