Hey there, Deb. The audio level is lower. No difference in quality. You are also correct in your assumption that the firmware file is different from the 799. Glad to help. Shane Jackson, Amateur Radio Station: K4JSJ Hoover, Alabama, USA "All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness; so that the man of God may be adequate, equipped for every good work." 2 Timothy 3:16-17 (NASB)