Yes, control voltages work with the expression pedal input. 0 - 3.3V on the tip is the correct range, but voltages outside that range should not cause damage. The Particle and Bitmap scale the CV input by the knob setting, so you can send +5V or +10V and use the pedal's knob to bring it down to 3.3V. The Raster expression input overrides the knob, so you will need to scale the CV output.
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 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.