I use my ears for volume adjustments as well. I do like the default volume setting in the 976 menu, although it's a global setting.
As Owl's_Warder points out, every source is slightly different. It would be nice(r) to have this setting for each input source. The 976 starts out at -40dB, but I've had to set mine to -60dB for the TV converter source.
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Main HT <> 976 <> 7200 <> Ultra-X12 <> sapphire ST2 mkII RF/LF <> sapphire SC center
sapphire ST2 mkII SBR/SBL <> sapphire SS SR/SL <> Verizon/DVR <> Vizio M70Q7 <> Oppo UDP-203 <> Amazon 4k Fire TV