I was only going to run the pip up to the empeg, not straight into the guts. That way the air wont freeze the player. thinking about it now, I might need some sort of condensation knockout chamber, like a small plastic container with some cotton wool in it. the pipe could go in and out at the top so the air has to change direction, dropping any water into the cotton wool.
Hmm. bit more planning needed.

BTW the fan is going well, anyone got a resistor value to reduce the speed?