I need a potentiometer controlled by only a 0-10v signal
The most interesting way might be to use one of the Atmel ATTiny chips (ATTiny 13A would do it) or an Arduino. Divide the 0-10v by a convenient amount (2 or 3), read it in to the ADC and generate a PWM signal proportional to the input voltage. 

If you want to do it the easy way, then this seems to be exactly what you need.