Open your preferred audio production program, such as Logic or Pro Tools.
Click "File" and select the session to be mixed from the drop-down menu.
Open the "Mixer" window. Typical audio production programs have a variety of view options to suit various applications. For example, the "Edit" window is for moving individual notes around.
Move all virtual fader dials to the middle. This provides a neutral starting-point for balancing. Mute every channel apart from the ones receiving drum kit microphones. Play the track.
Adjust the kick drum fader dial up as far as it will go before the signal distorts. Start with the lowest register instruments to build a foundation and work your way up through the frequency range.
Adjust the rest of the drum kit faders to create a balanced sound. You may need to reduce the kick drum sound slightly to allow room for other drums, but the aim is to get every instrument as loud as possible without cluttering up the mix.
Balance the bass instruments. Un-mute the bass and adjust the fader so that it sits with the kit. It should be approximately as loud as the kick drum. Balance the remaining sounds by moving the faders up and down. It's a fine balancing-act, so use your intuition and taste. Refer to professionally recorded music as a mixing reference.
Click "File" and select "Save As." Name the track "Song Name Final Mix" and export as a ".Wav" file.
Click "File" and select "New Session" to open a blank audio session. Click "File" again and select "Import Audio." Import the mixed song. This opens it as a single audio file.
Click "Tools" and select "Multi-band Compressor." This lets you cut and boost the various frequency bands present in the final mix. This process is distinct from individual instrument mixing as it affects the entire audio without giving any instrument undue prominence.
Observe the compressor sound wave graphic to determine which frequencies are lacking. The smaller peaks represent weaker frequencies.
Adjust the slider dials on the compressor for the weaker frequencies. Move the others up and down to get a more accurate feel for whether they require adjustment. Start at the bass end of the compressor on the left and work your way right.
Import a professionally released song in a similar genre to your song into the multi-band compressor window. Compare the sound wave graphics side-by-side and adjust your master mix accordingly.