Thanks all for the info, interesting to get other perspectives.
Another question arose today, its a small item but I am interested to see how others approach this.
The new carrier I just joined leaves the SEL light on the entire time so that the FO tunes only VHF 1 through RMP 2.
Every previous carrier I have worked for selects the SEL button to change frequencys then selects SEL off again until the next frequency change.
Supp Proc states "If the SEL lights come on, when tuning the radio, the pilot should turn them off by selecting the appropriate radio system dedicated to his RMP."
Does anybody know the reason that Airbus prefer the SEL light off?