Open the software. This will then take you to a screen where you can see tools such as Open File(s), Convert, Settings, and Help.
Click on Open File(s). Search for the folder where all the MIDI files are stored. You can click on them one by one, or you can drag all of them and drop into the screen.
Select the files you wish to convert. You will know the type of format by looking at the Type column. Make sure that it says midi. You can also change the tempo of file by dragging the Tempo slider.
Click on Convert. Select the conversion type you desire. In this case, you want to change the MIDI files into OnlyMP3 Converter files. Once the option has been selected, the conversion process begins.
