I have the same problem. I have a Roland TD1-KPX connected with Ez Drummer by USB/MIDI port and ASIO driver. And I cannot play any backing track mp3 together, the ASIO driver occupied this audio port.
Is it possible to open a mp3 file within Ez Drummer?
Is there any other solution for this?
Anybody try to use Audacity to play de ez drummer and mp3 audio together?