[lincpimp]

Dig depends on what type motors you run.

If you run a pair of bl motors and escs the dig is controlled by the radio settings.

If you run a pair of brushed motors and a pair of escs the dig is also controlled by the radio settings.

If you run a pair of brushed motors and a single esc you can control the dig with a microswitch and a servo. You still need a 3rd channel on the radio, but it is cheaper than a full option 4-6 channel stick radio.