Valentino,
Once I have the file rendered to .wav I run it through a free program called Wavepad from NCH software. In this program, I remove the count in beats and trim the end of the song and usually add a fade out in Wavepad. Then you can amplify or normalize the file to whatever level you wish. I usually normalize the file to -3db within Wavepad and save it as a .wav or .mp3 I've used this method for many years with no problems. The Wavepad sound editor is free and this is the only part of their software bundle that I use. I've tried some other features within wavepad but didn't like those. The Wavepad sound editor has worked flawlessly for me and is very simple to use. I use Band in a Box and Realband exclusively for my DAW and use Wavepad as the final amplification software. I've done over 300 songs this way so far with no problem. I usually save it to .mp3 and load them on my tablet for playing at gigs, running the tablet audio through a PA system as an accompaniment.

Del