This is the software I use to mix all of my professional audio.

Once upon a time, this software was offered as a free trial, but no more.  I am the only person on the face of the earth (I believe) who has the license to distribute this version, which is older, but works perfectly fine.  (The Master Version is around $40).

So for $5, you can download this fabulous tool (for PCs only).  You can also get its companion software, the Audio Recording and Editing Program, WavePad at   http://pennyhaynes.com/products-page/software/wavepad-audio-recording-and-editing-software/.

Lastly, you can get my complete Advanced Audio Editing course at http://pennyhaynes.com/products-page/classes/advanced-audio-editing-course-video-using-wavepad-and-mixpad/.   This will have you editing professionally in an hour!