How the tools work, and why.
One mixing problem per note, taken down to what the processing actually does. With audio you can play here.
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Why the Pultec low-end trick works, and when it doesn't
Boost the lows, dip just above. The move every engineer knows from a passive EQ, why the fixed frequency is the part that fails, and what happens when the dip follows the material instead.
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Why algorithmic reverbs ring, and what modulation does about it
A long tail that turns metallic is not a bad reverb, it is a network of delay lines left to decay. Where the ring comes from, what modulation costs, and what a flock does that an LFO cannot.
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How to widen a mix without breaking mono compatibility
Wide on headphones, thin on a phone. Where stereo width actually lives, why most wideners collapse when summed, and what it takes to add width that folds back to nothing.
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Parallel saturation on drums and bass: drive for character, blend for dose
Drive for character, blend for dose. Which saturation curve suits a kit, a bass or an 808, measured harmonic by harmonic, and where the mix knob should actually sit.