Set the kick to -12 dBFS. Now, turn up the
808's volume. When you hear the 808, stop. Don't drown the kick. If the 808 is too loud, do one of the following: it needs processing with a
spectral effect or a different sample. Also try to reverse the polarity of the kick drum while it's playing with the 808 bass. Listen to see which sounds better. Use a sidechain to lower the 808 bass or the whole volume to an appropriate level.