To my ears, this method seems to reduce the bass in the audio and gives the sound a less muffled quality seems to boost the mid frequencies which , gives better clarity than just increasing the volume control as I stated (to my ears) and I'm sure you will agree, we all hear differently it was just merely a suggestion.
And, I do understand the purpose of the offset feature as in over 40 years of scanners, I've never seen a single one of them that had the exact level or sound on every frequency/channel.