Thank you. I went to settings/call/noise reduction and turned it off. Will that help? As to Bluetooth, which I use for all phone calls, I have been unable to figure out how to get the phone to use the Bluetooth when using Evernote - I have tried, but see no way to tell the app to get sound from Bluetooth not the handheld. I use a Plantronics Voyager Pro.
Have Samsung S4. Do a lot of voice notes / audio recordings. When I play them back volume goes from very loud to so soft I can barely hear it, and then back again. Any ideas what might be causing this?