From the manual
The upper part of the front panel offers con-trols for the signal analysis blocks. The enve-lope follower input jack (9) labeled follow is internally normalled to the output of the import block, but it allows for directly patch-ing other signals.
there is no level in cv for the export block so the module on it's own will not do what you ask
however you could just use a vca
having just re read your original post:
the sewastopol does not do wet/dry mixing - a simple way to implement this is to use a cascading vca and an inverted copy of whatever you want to use to modulate your wet/dry mix - mult of original signal into ch1, sewastopol out into ch2 - modulation and inverted modulation into cv inputs of vcas - which channels will depend on how you want to modulate them
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities