It’s hard to get the volume set right on a busy frequency with the meters bouncing around..
Tune the scanner to another, quite, frequency say 121.500, to set the volume.
The volume on my scanners, two into one sound card, is halfway.
In the recording control, the input volume is between the second and third marks on the slider.
Meters hover at a hair over -30db and the volume reading in the taskbar of acarsd is between 8 & 10 with just static coming in.