Channel by channel scenario modeling & response curve questions

Hello,

I have two questions that I would really appreciate your help with:

1. For the media response curves generated by robyn_allocator, are those incremental or absolute values? Meaning, a point on a curve with, say, x = $2k and y = 1, does this mean if I spend $2k _in addition_ to the baseline number spent during the date_range I will get an _additional_ 1 conversion, or does it mean if I spend $2k I will get 1 conversion?

2. Is there a way to do channel-by-channel scenario modeling? Meaning, suppose I'd like to know what the response will be if I spend $X on channel Y while keeping the spend on all the other channels the same. Is there a way to do this?

Thank you!
Natalia