Like most set ups, in this case 2 scanners but with 3 freqs, it's split.
The Atis is all by itself, and I did just listen to Ground/Tower, and it's not the Atis you may be hearing.
Ground/Delivery and Tower are split into left channel / right channel.
swing your balance bar one way or the other to filter, either on your computer,
or on the LiveATC app.
john