Q: I have noticed slight differences between channels when turning the potentiometer, is it broken?
A: It is quite normal to perceive small tolerances in the lower range of travel of the potentiometer due to its mechanical construction.
Think of if this way: a two-channel potentiometer is like an axis with two rings. When you move the pot you are actually moving the rings over two contacts. To be able to provide a perfect match from the very beginning of its travel, the mechanical construction of the potentiometer would have to guarantee tolerances well below one millimeter. A precision that high is only available at extremely high prices.
However, during quality control we make sure that only the lowest range, which is not that relevant, is affected. It is important to remark that the small time delay needed to guarantee a safe contact is made does not really say anything about the balance between channels, which can still be excellent. If you notice larger tolerances in a more relevant range, do get in contact with us. In such cases, your equipment most surely needs maintenance or repair.