I have just started researching talk box's and correct me if I'm wrong, but from what I have figured is that, when using a rocktron banshee talk box, the sound travels like this..

Guitar --> Amp -->Through effects loop into talk box --> through tube into mouth --> excess sound goes into mic --> goes through PA

Firstly, have I got the right idea with that ^^ ? Its been a bit confusing

And secondly, could I swap the PA for using the line-in of another amp? Or will sound quality be reduced a fair bit?