For clarification,
The U/Tronics Control normally comes with a 10 K ohm slide potentiometer (pot), but for this use we recommended using a 50 K ohm rotary pot. But only use 1/5 of the total travel of the rotary pot shaft (10 K ohm).
A normal rotary pot has 270 or 300 degrees of travel, but by limiting it to 54 or 60 degrees of rotation the U/Tronics Control Single Channel unit functions just the same as with the 10 K ohm slide pot connected.
All pots used with U/Tronics Control units are linear taper, not audio taper.
Clancy