For uncompressed WAV, standard settings are used. If you select MP3 as output format, you can fine tune its quality settings. Click the “Setup” button (see the screenshot above). This will invoke options menu:
Set preferred values and click “OK” to save them.
We recommend to use at least 128 Kbit/s bitrate for music. Higher settings result into bigger files. Free M4a to MP3 Converter supports full range of MP3 bitrates and frequencies.