Hey Mark, I've got an R26. When you record multiple channels e.g. 6 channels (XY built-in, Analog 1 & 2, Plug-in Stereo 3.5mm), the left input knob is for XY mic level, the right is for analog input level (only 1 level setting for the left and right mic inputs, not one per input!), and then there is a soft on-screen level settings for the external 3.5mm input.