Change the output name if necessary, which must be a wave file. Or click the Browse button to name the file in a directory.
Then click the Convert button, the conversion will start. Please make sure you can hear normal sound volume of the MIDI file when converting, otherwise check Windows Volume Control.
After the conversion is over, click the Play button to listen to the wav file with Windows Media Player. Before start the next conversion, please exit Windows Media Player.
If you feel the output wav volume is smaller or louder or distorted, adjust the volume control of the program, or "Volume control" or "Wave" of Windows Volume Control. Then start conversion again. Try several times, you will get the appropriate output volume.