Here's what I found on the internet, hope this helps...
http://www.autotechs.com/items/item299.htm
Audiovox - Prestige - Pursuit - PRO - Programming
PROGRAMMING TRANSMITTERS:
It is important to remember that during programming, each individual step of the procedure must be executed within 15 seconds of the previous step. When the 15 second time limit is allowed to expire, the system will automatically exit program mode. This is indicated by a long "chirp" from the siren. Additionally, any time the ignition key is turned off while programming, the system will immediately exit program mode. This is also indicated by a long "chirp" from the siren.
TO PROGRAM ADDITIONAL TRANSMITTERS:
I. Enter the vehicle, and turn the ignition key to the "on" position.<br>
2. Move the valet/bypass switch on - off - on - off- on then off.<br>
3. The dash L.E.D. will flash one time, and the siren will "chirp" one time, indicating thesystem is ready to accept programming for channel 1, or the arm/disarm and panic functions.
4. You can assign any of the three transmitter button functions listed below to channel 1.
a) Pressing button #1 on the keychain transmitter.
b) Pressing button #2 on the keychain transmitter.
c) Pressing both buttons simultaneously on the keychain transmitter.
5 Press and hold the selected choice a, b, or c above, until the siren emits a long "chirp" to confirm that programming of channel I was successful.
6. Move the valet/bypass switch on, then off again.
7. The dash mounted L. E. D. will flash 2 times, and the siren will "chirp" one time, indicating that the system is ready to accept programming for channel 2, or the pulsed ground output for remote trunk release, remote car starter, etc.
8. You can assign anyone of the two remaining button functions listed in 4a, 4b, or 4c above to operate channel 2. You cannot use the button(s) that operate channel 1, selected in step 5, to operate channel 2.
9. Press and hold the selected choice. The siren will emit a long "chirp" to confirm that programming of channel 2 was successful.
10. Move the valet/bypass switch on, then off again.
11. The dash mounted L.E.D. will flash 3 times, and the siren will "chirp" one time, indicating that the system is ready to accept programming for channel 3. 
12. Press and hold the remaining transmitter button function. The siren will emit a long "chirp" to confirm that programming of channel 3 was successful.
13. To exit program mode, either turn the ignition key to the off position, or move the valet switch on then off one additional time. This is indicated by a long "chirp" from the siren.
QUICK REFERENCE:
You can program any individual channel, without reprogramming all channels, by following the quick reference chart below.
CHANNEL VALET SWITCH L.E.D.
1) ON then OFF 3 Times I Flashes
2) ON then OFF 4 Times 2 Flashes
3)) ON then OFF 5 Times 3 Flashes
After the desired channel is programmed, turn the ignition key to the off position to exit programming mode.