I don't know what you consider easily but you tap the screen and then hit plus or minus. Every unit I've had has done that.
Sounds like it is easy!
On the 530 you need to make half a dozen button presses, while the 705 had dedicated scroll in/out buttons. Unfortunately the 530 didn't keep them.
Probably it is easy on all the touch screen units. Now the touch screen ones have all the buttons, I should probably upgrade..
830 is 530 with touch
@frank9755 started
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I don't know what you consider easily but you tap the screen and then hit plus or minus. Every unit I've had has done that.