The wireless works ok if I use it without a song.
Well, that certainly changes things...
As RJ asked, "We know the dongle is working ok?"
And the same song / sequence plays properly with the dongle attached, but without the wireless connected?
So if you have an LE (for example) attached to the dongle directly (through a cat 5 cable) and you play the same song / sequence, the lights behave as expected?
Then disconnecting the LE, replacing it with the Tx (using the same, "known good" cat 5 cable), the song / sequence hangs?
And you have the transmitter module sitting on some sort of an insulator - like a piece of cardboard (without any wire cuttings on it) - and not on something conductive (like an anti-static mat)?
Sorry for the 20 questions, but the fact that you're seeing the wireless work - but not with the song playing - really changes the nature of the problem - likely taking us back to a problem with the dongle (as RJ suggested) or a problem with the song itself.
Let us know what you find...
--Dave