Power station PS-100 line out

As the manual say I connect my PS 100 line out to the Power load IR line input, in this case I have no attenuation or boost available from the PS 100 as, it seems that attenuation or boost is only available for a speaker cabinet ( PS 100 speaker out ) but not for the line out ( ? ). Anyway I have to use the line level for line out level. Is it correct ? I wish I could get the attenuation or boost also for the line out but fortunately this sound of line out to line input ( Power load ) is fantastic, better than the Power load alone.
The ultimate machine would be a Power Load with the PS 100 features !! Please Mr Fryette…