Thanks to help received in this forum, I now have Airtime passing 'airtime-check-system', using .aac instead of .ogg output.
I have an automatically generated Icecast2 mountpoint, & would like to change its default values. Below is a link to a screenshot showing what I have, & what I'd like to change is underlined in red.
Would someone kindly advise as to how I can customize these values?