1. Compile songs, as is, on a disc and listen on multiple systems. Here you'll be taking notes, bass/mid/high shy or heavy, no-dynamics, too dynamic. 2. Next either go back to the mixing stage to fix these problems and then repeat 1. or adjust this stuff in the mastering stage using a very wide Q EQ along with some compression to reduce dynamics on the heavily dynamic songs in REAPER (unless you're mastering in another app, why you traitor). BTW- make sure you listen to your songs on different speakers and in a different room (if possible) when mastering that you mixed on (this really helps). 3. Put the songs on a disc again and take notes. Fix these in mastering. That's all I got, it works for me, as I too am very poor.