I have had a couple of these radios over the past couple of years. I have one that is working very well, and I wish to keep using it, but the volume control his horrible. I have it all the way down and head a hiss. If I turn it up a bit to hear the conversation that it is WAY too loud. I am looking for suggestions of how to best mitigate this. I have searched the internet and can't find anything. Thank you in advance for any help!