this is the modulargrid product page and Pusherman description
"ATN8 is an eight channel signal processor. It can be used as an attenuator, attenuverter, offset generator, mixer and CV source. A bicolor LED accompanies each channel to provide visual feedback of the output level. Each channel is normaled to the next one so it can be used as a mixer as well.
If there's no input on a channel, a selectable 5 or 10V is normaled to the input, these can be selected in two groups of four with the switches on top.
There are switches for each channel to select between unipolar or bipolar modes."
the 4th sentence (separated out for convenience) is the relevant one - but even looking at the controls it's kind of obvious that a single channel cannot do both attenuation and offset - only 1 knob, no switch
Utility modules are the inexpensive, dull polish that makes the expensive, shiny modules actually shine!!!