MP3 Shield stacked on DMX Shield - Arduino Uno We are using Arduino Uno revision 3, with TinkerKit DMX Shield rev. 4 and Sparkfun Mp3 Shield.

We uploaded the Mp3 Shield example called FilePlayer and after we open the serial monitor, the interface is there and working. The problem is that it won't output the music from the SD card.

If we ONLY stack the Mp3 Shield onto Arduino, it works.

Is there some king od incompatibility between the DMX and Mp3 Shield, and if there is, what would be the solution, maybe some kind of bypass, since we aren't that familiar with what pins the DMX shield uses for it's purpose. ATM the Tinkerit site is down so we can't acess the TinkerKit DMX Shield datasheet.
Yes, overlapping is a problem, by default the MP3 Shield uses digital pins 2(DREQ),6(mp3CS),7(mp3DCS),8(RST),9(SD-CS),11(MOSI),12(MISO),13(SCK)

The Tinkerkit DMX Master Shield R4 uses 2(RE-ENn),3(VTX),4(VRX),5(DE-EN),6(D6)

So there are conflicts with D2 DREQ vs RE-ENn and D6 mp3CS vs D6.

The DMX Master Shield basically converts the UNO's serial to DMX. If nothing is at first included into the Sketch for this, then the problem is with only D6. Leave this jumper OFF. And I suspect the MP3 Shield will work stacked.

To use them together you can move the pins, as demonstrated at https://www.youtube.com/watch?v=behMgV3tUr4. Noting that is for different pins. And of course you will need to subsequently change their definition, in the sketch.