10 Killer Mixing Tips That Will Professional Your Sound Remove the sub bass frequencies of every instrument except the kick and bass. Low-frequency dirt and mud hide in the most unexpected places. These hidden artifacts can disturb or add mud to your sub-bass. High-frequency instruments like hihats, tamborines, and shakers are notorious for hiding low frequency dirt that may not be able to hear. High-frequency FX may be hiding some of these low-frequency artifacts as well. A couple instruments hiding low frequency artifacts may not pose an issue to your sub bass, but, too many of these untreated instruments may...