Just because a scanner has 10 channel or a million channel frequency capability, it doesn't mean that every channel has to be utilized. I've learned that the more frequencies you scan in one radio, the more comms you're going to miss.
90% of my radio hobby is aircraft comms related and I keep six of my scanners parked in manual mode on one frequency each. That might sound extreme, but with 550+ airline flights and business jets passing overhead at high altitude on a daily basis, it gets rather busy.
Scanners one & two monitor the ARTCC high and ultra high sector frequencies that pass above me, 120.825 & 132.875. It's a lot to listen to since I tape both sectors 24/7.
Scanner three monitors the ARTCC low altitude sector above me, 125.3.
Scanners four & five monitor the AR-110 & AR-111 air refueling tracks, 327.6 & 348.9. I tape both AR tracks during the day and evening hours.
In scanner seven, I tape military aircraft comms on 319.0 for a buddy of mine that lives in Mississippi.
Scanner seven has the most frequencies that I scan in one radio and that's the 127 airline ops frequencies in the 128.85-132.0 range.
Scanner eight monitors the 10 VHF ARTCC high and ultra high sector frequencies that surround me. I normally just scan the ultra high frequencies, however.
Scanner nine monitors 28 miscellaneous military aircraft frequencies and it's taped during the day and evening hours.
Scanner ten monitors 2 railroad frequencies that are rather busy, 160.41 & 161.1.
Scanner eleven monitors 22 local public service frequencies.
Scanner twelve is used primarly to experiment with and to test new frequencies.