The MAP is not stored on the Switch.
If you want to "Turn it off" you set the selector switch to 1 and put it into the OBD port and wait for the 3 ascending beeps.
When you turn the map back on you use either the no.2 or the user presets A,B,C
2 is REVO Default performance option which iirc is Boost 6 Timing 2 Fuel 9
Option 3 turns on anti theft (excellent as it disables the accelereator which means even if some scrotum has your keys they couldn't drive away with the car without that switch)
Option 4 Disables Anti-Theft
With the user presets you can have 3 different settings for the car.
For Example my switch has the following: ( i am Stage 2+ btw)
A = Boost 9 Timing 5 Fuel 8
B = Boost 9 Timing 6 Fuel 6
C = Boost 9 Timing 7 Fuel 6
Now before you go messing with the settings you need to use VCDS to log what is happening to the car with the changes you have made.
But you alter the settings by using the software included in the ox on the CD
Any probs PM me if you wish
HTH
Carl