| switch | parameter |
| -a | downmix stereo file to mono |
| -b | bitrate (32, 40, 48, 56, 64, 96, 112, 128, 160, 192, 224, 256, 320) |
| -c | copyright |
| -e | de-emphasis (n, 5, c) |
| -f | fast mode |
| -g | turn on MP3x graphical frame analyser (might not be available on your release) |
| -h | high quality |
| -k | full bandwidth |
| -m | stereo mode (s, j, f, m) |
| --nohist | disable histogram display |
| -o | non-original |
| -p | error protection |
| -r | input file is raw pcm |
| -s | sampling frequency |
| -S | silent operation |
| -t | disable VBR tag |
| -V | VBR quality setting (0...9) |
| -x | swapbytes |