Can I program the ServoStation to output different voltages?
No. The outputs are fixed at 5 volts for the receiver and 6 volts for the servos. You must ensure that your servos are rated for 6 volt operation, and if not, either don’t use a ServoStation, or if the total current drawn from the 5 volt supply will be less than 1 Amp you can simply plug the offending servos directly into your receiver (which runs on 5 volts).