To set the output format of the result file press on the "Output Format" button on the toolbar.
You can specify the output format of the result and also other output settings such quality,
bitrate, sample rate, channels, bits per sample, cbr, vbr, vbr quality e.t.c.
You can also choose predefined values based on quality.
VBR stands for variable bit rate encoding and CBR for constant bit rate encoding.
Simple MP3 Cutter Joiner Editor has the unique feature to allow you to edit all the various encoder parameters that FFMPEG supports in an easy to use interface.
You can choose, for example, whether to use joint stereo and average bit rate (ABR) for the MP3 encoder or set various mov muxer flags and stereo coding method for the AAC format.
After choosing your output format settings press on the "OK" button.