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Hello! I had an idea nowadays how to control a lot of PF motors without very complex and space requiring mechanical switch: http://www.brickshel...ry.cgi?f=537994 The conception is simple: I used only electric components to switch between the motors. There is two receiver blocks, each contains 3 receivers. The fourth receiver has the swicthing motor, and the 13th motor can be connected to the other output. So the system in the pictures can be control easily 12 + 1 motors. One advantage is that the switching itself is very fast. If you connect two switching motors to the 4th receiver, you can use 24 motors. Indicator LEDs are recommended, so you always can see, which block (=which functions) are switched on. The blocks can be switched on individually, because the controller motor(s) pushes the battery box's on/off button. To control 13 motors, you need 7 receivers, 3 battery boxes, and 1 M motors. To control 24 motors, you need 13 receivers, 5 battery boxes and 2 M motors. I don't think the amount of PF parts is a problem. If somebody makes a huge moc with so many motors and functions, then 7 or 13 receivers and 3-5 battery boxes aren't so much in money and requiring space. A lot of builders are still have these. More pictures: Video: Hope you like it. Edit1: I forget to say, you can't switch off the receivers through PF switches. At the beginning, I thought at switches and one BB, but it's simply doesn't works. Each block needs a battery box, the receivers can only switched off with them.