Non-manual speaker selector?

The house we purchased several years ago has built in speakers in 6 locations hooked up to a Niles speaker selector. Each room has a separate volume control and I’m running 2 channels from a marantz 7007. However the speaker selector is in an odd location and being that it’s manual one has to always go to physically turn rooms on and off.  Curious if there are “digital” speaker selectors that could be accessed via an app, and if not if it’s prudent to leave all six zones on all the time but dial down the volume to zero in any room not being used. I’m not familiar with how these selectors match the load and whether that would put a burden on the 7007 receiver when running zone 2.