@matt has there been any thought on providing a button where the user sets custom x and y axis levels?
Yes, and it’d probably come with a makeover for the graphing. But it’s not a near-term thing.
Using the ymax/ymin buttons with control pressed changes them very quickly (I think 20 dB per click), and with alt pressed changes them very slowly (I think 1 dB per click). A normal click is 5 dB. Not sure if that helps.