For me there is a wierd phenomenon. When I put several effects after another, and try to set the volume on the same level (on bypass level), sometimes I have to set the output to very low level, let's say to 3, or 2. That's kind of wierd, when your scale is from 1-100.
Also, for example at distortions, most of the time I have to turn down the output, to maintian unity gain, and the output level changes almost nothing between let's say 60-20 and then dramatically changes, under 20. (they are not exact numbers, I don't have the pedal with me). So somehow it looks like, that the small steps in volume from1-100 are not linear. Have you had the same experience?