Could I use a non-aerosol cologne such as Armani Black Code as a bass before I apply pheros? Or will that dampen the effect?
Haven’t noticed a difference, I typically cover tho, which is apply over the mones once it is on the skin
Yes you can, no problem at all. 
ETA - The only exception is A314 oil. You can use a cologne or other pheros no problem but you need to keep the application points apart as the alcohol can affect the oil’s diffusion.
If your nose can handle the cologne and you don’t overdo it I don’t see why not.
I myself am not much of a cologne guy myself and love the grab and go products smartmones put out.
dsouza