Can the audio Compression be turned off or ratio changed in the programming?
In the Advanced tab of each personality, there is a drop down for Compression Type. You have your choice of Disabled, Full, or AGC.
So the answer is, yes, you can disable compression if you want, channel by channel.
Also, in Radio Configuration on the Basic tab, you can enable or disable the Audio Processing Filter. That may or may not help your situation. But that is for the entire radio, and not just one personality.
(Version R06.12.09 of HVN9025 Professional Series CPS)