Vertex VX-4000 audio question

I'm running a VX-4000 uhf through a local repeater and I'm getting reports back that my audio is very low on the receive end. I'm hearing repeater traffic just fine and my signal is hitting the repeater strong, it's just very quiet. I have it set up in my vehicle as a dual deck single head. The other deck being a low band. The reports of audio levels on low band are good and loud. Any suggestions or ideas? Is there a setting in the programming that allows me to increase the mic gain? Thanks in advance.





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