Trigger audio

hi,
I am trying to play track1 if gps input signal to uno = 20mph, play track2 if 30mph.
I have the ultimate gps & uno working correctly, I just cant get uno to trigger an audio player.
seems simple enough until you try it!
audio modules tried;
vs1003 can't get anywhere with this,
ka02, cant get anywhere with this,
an mp3 player and hard wiring button to uno o/p, some success

i have read/tried so called examples for the boards, most don't work or are full of errors, manufacturers do not have any support or actual info on how or what the pins are etc.

some actual help on how to wire & trigger one of these borads would be great.

Procedures differ significantly, whether you have to send sound data to an output device, or whether you send commands to an MP3 player holding the tracks to play.