Plug an audio Y-cord into the "Out" jack on the computer where you're running the digital mixer. Connect the other end of the cord to the input of your stereo sound monitor system.
Highlight a one- to two-second clip of recorded air and save it as a noise reduction file in your digital mix. Apply the saved file to your recorded mix.
Equalize your mix using the graphic or parametric equalizer. Achieve your desired sound by accommodating for the low, mid and high frequencies as needed. Every mix is different and highly dependent on the conditions of recording equipment, instruments and vocalists.
Apply effects such as reverb and echo if needed. Use your ears and gauge what is missing from the mix. Use effects sparingly so they do not overpower the mix.
Compress the mix using a hard or soft limiter plug-in. A hard limiter reduces amplitude at a designated dynamic range by "clipping," while a soft limiter allows an appreciable increase above the range instead of clipping the sound.
Apply a compression ratio of 2:1, 3:1 or 4:1 depending on your tastes. A 1:1 ratio will yield no difference, and a 2:1 ratio will reduce a two-decibel increase above the threshold to a one-decibel increase. Apply an "attack" (speed of the compression) between 1 to 20 mS.
Add any remaining effects to each individual mix as you see fit. Remember to use your ears and avoid working backwards, that is, mixing to the point where the effect is detrimental to your song. When you are ready, highlight all the tracks in the mix, right-click and select your program's option to create one master mix.