Level/gain of correction

Because correction can be positive in amplitude at certain frequencies, it is important to check the global level of the correction to avoid any overload. This won’t generally be a problem inside the processor itself but you need to check at the processor output, before D/A conversion : because many music tracks are mastered at a very high level near digital fullscale, you need to check that level of music with correction never exceeds fullscale. It is wise to reduce digital level so that the max level of correction is under 0dB, ie -1dB is fine. If you really want to avoid any intersample peak, you can even set max at -4dB.

Also when comparing before/after correction, you have to adjust level to match : with typical setup, you will generally need to reduce uncorrected level by some dB for a valid comparison.