Sound InDepth is an interesting, free and very complete application to create, edit and add effects to your music and sound files, besides having options to optimize the quality of the resulting files.
Sound InDepth works with the following audio formats: MP3, MP2, WAV, MP1, VOX, G726, G723, G721, RAW, PCM, OGG, MPC, DSS and CDA.
Among the different effects and filters that can be applied to music are being able to vary the intensity of volume (even becoming irregular), amplify, normalize, insert echoes in certain fragments, insert noises, define the frequency (can also increase it), insert vibrations, control the various channels (as well as be able to duplicate them), etc.
You can free download Sound InDepth 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.