On your AVR , if you have ´´ power out ´´ , to connect the front speakers to another amplifier, ; then you can use a integrated amplifer with HTBP.
When using the AVR,( for movies ,etc ) only the power amp. section of the integrated will be used. This is where the ´´ bypass ´´ takes place.
Center and surrouds speakers will be played by the AVR.Fronts will be played by the integrated.
When using your analog sources,connected to the integrated ; the power amp. and preamp. sections of the integrated will be used.
That way your front speakers are connected to the integrated amplifire.Leaving the front speakers connections of you AVR unused. Only the fronts speakers will be played .
The bypass on the integrated shut down his preamp section.
Other wise , you would have two preamp. fighting each others :
preamp of integrated against the preamp of the AVR
With a HT processor , it is no probleme.