What setting changes the sound quality when downloading from iTunes?
my sound quality has changed for the worst when I download from iTunes, have my kids accessed a setting accidentally?
iPad, iOS 8.3
You can't change what format music is downloaded in from the store, it will be in .AAC format - it can only be changed if you synced it from your computer's iTunes and have modified/created new versions of the tracks on your computer and synced those to your iPad
There are music playback settings in Settings > Music on your iPad.