Is there a simple way to convert .wpp files to .mp3 format.
Converting WavePad Project Files directly to MP3 Audio Files (.wpp to .mp3 conversion) is absolutely possible and very straightforward, even though it is not a conversion in the proper sense. Your options are, however, limited to using the original software.
Use WavePad itself, as it allows users to export its WPP projects in MP3 format.
An audio editing software for Windows and Mac