200e

Does a anyone know if you need to invert the output of the 292e before 
mixing back into the input (via a mixer) to increase resonance and if 
so how would one invert the signal within a 200e system.

Second question; anyone see a problem with using a small non-powered 
resistance mixer within the audio path of a 200e system...any issues 
there other then a potential slight loss of overal output from the 
mixed signal and no boost ability?

Thanks very much!

Andrew