It dawned on me while measuring the Phono stage of a preamp, that it would be nice to have the (HiRes) RIAA weighting as a button tab instead of “C” weighting, which I have never used. Maybe this could be set under preferences? Maybe the “C” weighting is used by folks more ?
I like it the way it is as I use A+C, but the option to rename a user button would be cool. That way you could call user-1 or user-2 whatever you want, like ‘RIAA’… 
@restorer-john- The option of assigning user 1 or 2 to RIAA would be ideal, thinking about it some more. The only time I use C weighting is on my Realistic SPL meter 
I have never seen anything but A weighting on the specs of the gear I test- but possibly those that test microphones may use it… Not that @matt doesn’t have enough things on his plate..