every digital lanechanger system used has some flipping electronic (called "lanebrain" at scorpious; the system I use (scorpiuswireless.com
)) and something like the peco-switchmachine inside. Power is typically directly taken from rails (about 12 V in common cases will fit the electronics and the peco). As the electronic usually only gives the impulse (to switch or not to switch, thats the question...) you can use it from your system what ever kind of switchmachine you use (The original or the peco). The peco seems to be perfect as the current needed is low, it is robust and selfdesigning a flipper is easy. You can test it by buying one peco (about 10Euro), kill one lanechanger of the system you had chosen (You have to cut it anyway when plastering into your track if using the "cut-and-glue-method" described by the others above) and tryout if the peco works with your electronic and throttles. I guess it will. Depending on the system you use (SCX,Oxigen,Carerra,Ninco...) you have to think about diodes or deadstrips that have to be build in, too.
Dont worry, a little testrack will take all your sorrows away, just get started! Regards Jens