I'm slightly confused about a line from the uJack manual. Clarify?

There is a line that says:

LEFT Attenuator: This knob attenuates the level of the LEFT input. The signal is unmodified when the knob is fully clockwise, otherwise the level is reduced proportionally.

Does that mean that the output of the uJack is unmodified line level when the attenuator is fully clockwise or unmodified modular level? And if line level is it -10 or +4?

Thanks!

The attenuation is performed at the input, so before converting to line level.