Yes, control voltages work with the expression pedal input.  Our pedals expect a voltage of 0-3.3V on the tip (sleeve grounded), but voltages outside that range should not cause damage.  In most cases you will need to use a CV attenuator (a passive voltage divider will work).

The expression input has current limiting in case you use a TS cable, but it is preferable to use a 1/4” TRS cable with the ring unconnected.  We (sometimes) sell a suitable cable at our web site, and the Expert Sleepers 'floating ring' cable is another option.  Instructions for building your own cable are available here.