You set the volume to the highest setting on the integrated amplifier, and then you can use the Wiim App to control the volume. I've got an Emotiva TA-100, and I set the volume to the max, and I use my Wiim Pro + the app to control the volume. I also leave the TA-100 on all the time.Sorry if I'm nagging about this but: if you have the Ultra connected to an integrated amplifier (or analogue preamp) couldn't you just leave the Ultra on max volume and control the volume on your integrated amplifier or preamp? And by doing so still get even volume on main speakers and the subwoofer?