Hi David, No, there isn't a built-in way to adjust levels via DTMF. I concern would be if you accidentally got the levels far enough out, DTMF likely will no longer decode. 73, David KB4FXC On Sun, 12 Jul 2020, "kg5rdf via ARM-allstar" wrote: > Before I start poking around, is it possible to modify audio levels via dtmf?David KG5RDF