Kayla Reagan demonstrates a mix bus trick from engineer Jon Castelli, using Oeksound Spiff as a transient shaper to punch up the low end.
She narrows Spiff's sidechain detection down to a single sharp frequency band. Using Delta mode, she finds the exact harmonic that matches the track and carries the most punch, 174 Hz in this case. Miss it by even a hertz and the effect loses its magic.
With detection locked onto that one frequency, Spiff's transient boost triggers off it specifically, sharpening the kick's punch without smearing the rest of the low end.
She blends the processed signal back in at around 70% mix, so it reads as warmth and excitement rather than an obvious effect. Push it further and it starts sounding fake.