ok, Julai, what about this test I made: took a seller BE100 profile, did a recording with my daw (sonar8) through a FireWire audioboard. Sent the take to the seller which had to recognize the huge difference. The sound he was selling was not the one I recorded.
So, no controversial playback things here.
And so, even if we have playback things going on, as you mentioned, we are back at the beginning with an unsolved issue. There must be a reason for this so that we can work it out