Chapter 25 Exercises

Width is the easiest dimension to fake and the most expensive one to fake badly, which is why this set leans so hard on verification: nearly every drill below ends with a fold-down verdict, because a width decision isn't finished until mono has audited it. Work Part A first to load the frameworks, then do the Listening Lab before the DAW Lab — the pan maps you draw from professional records become the to-do list for your own field, and you'll seat your own tracks far better after an evening of hearing how the pros spend their stereo budget. The DAW Lab's centerpiece is C1, the LCR rebuild; it produces the pan map your mix will carry through Chapter 30, so give it the full session it deserves. Standing laws apply throughout: judge in the full mix, loop the busiest section, match loudness on every A/B, and log every fold-down verdict as fix or knowingly accept — in writing, the way Jaylen learned to. Exercises marked ★ have worked answers in the back of the book (Answers to Selected Exercises).

Part A: Conceptual Understanding

A1. Two cues, one forgery. ★ (10 min) A bandmate asks how a single knob can "move" a sound between two speakers that aren't going anywhere. Explain the two cues your localization hardware runs on, which frequency range each dominates and why (one word: wavelength), and which of the two the pan pot actually fakes. Then close the loop: explain why that half-a-forgery is precisely what makes ordinary panning indestructible in a mono sum, while the Haas trick — which fakes the other cue — dies on a phone speaker.

A2. The fold-down arithmetic. (15 min) Under a −3 dB equal-power pan law, walk the arithmetic that made Demi's vocal ride up on every phone at Jaylen's bench: what a center-panned track contributes to a mono sum versus what a hard-panned track contributes, and the roughly 3 dB tilt that results. Then state the chapter's three consequences of pan law in your own words — the fold isn't neutral, pan moves are balance moves, sessions travel but laws don't — and for each one, name the concrete habit that protects you.

A3. Defend three seats. ★ (10 min) A skeptical friend calls LCR "a retro affectation for people who miss old consoles." Write the four-part rebuttal: what the three-seat constraint buys (commitment, real width, the arrangement X-ray, speed), and the brutally simple test that governs every in-between position afterward. Finish with the honest caveat: what do headphones do to hard-panned edges that speakers don't, and what are the two defensible policies for handling it?

A4. The alley's three votes. (10 min) Kick, bass/808, snare, lead vocal — the power alley. Give the three independent reasons that converge on this placement (one rooted in playback energy, one in psychoacoustic stability, one in attention), and explain why the convergence matters more than any single reason. Then sort the vinyl-era lore: which part of "bass goes in the middle" was enforced physics at the cutting lathe, and which part survived because clubs, phones, and your own localization hardware kept voting for it after the stylus retired?

A5. Read the ledger. ★ (15 min) From memory, rank these five width tools from kindest mono bill to cruelest: a stereo widener at +40%, real doubles hard-panned, a Haas duplicate at 18 ms, a chorus/doubler plugin, a bit-identical clip duplicated and panned to both edges. Justify the ranking with the ledger's organizing principle — the more the channels differ by performance, the kinder the bill; the more they differ by fixed signal math, the crueler — and then state the 🔍 block's one-sentence law that the whole ranking falls out of. (Careful with the duplicated clip. It's a trick entry.)

A6. Mid-side in plain words. (10 min) Define M and S in one line each, including what each one literally is on a phone speaker. Then explain the chapter's claim that "every widener plugin is an S-booster in a trench coat," and describe what you heard — or would expect to hear — when S-soloing a professional reference: what lives in the gamble, what's conspicuously absent, and what habit that absence should install in your own mixing.

A7. Meter literacy. ★ (10 min) Two mixes arrive for feedback. One reads +0.9 on the correlation meter all song long; the other camps at −0.2 through every chorus. Diagnose each in two sentences — which one has a problem, what kind, and what you'd say to each mixer. Then translate both mixes into goniometer shapes, and explain why the meter stays advisory while the fold-down ritual remains the court of record.

A8. Doctrine, recited. (10 min) From memory: list at least six real-world playback situations where your stereo mix gets summed (or close to it), write out the five-step fold-down verification ritual, and state the standard that separates mono-compatible from mono-identical — what's allowed to shrink, and what's never allowed to vanish. Check your ritual against the chapter afterward and note which step you forgot. (Everyone forgets one. It's usually the logging.)

Part B: 🎧 Listening Lab

Ears first, always. These drills train the width pass of your Chapter 4 listening discipline from "it sounds big" to "I can draw it." Use both your monitors and your earbuds — the chapter told you why their edges disagree — and keep the listening journal open. Phone required for B3; one earbud required for B4.

B1. Pan-map three records by ear. ★ (45 min) The drill this chapter's closing promised you. Draw three empty stages — a horizontal line from L100 to R100 with the center marked — and seat every element you can identify, one record at a time: (1) AC/DC, "Back in Black" — start here because the map is almost a diagram of this chapter: count what's welded to the center and where the two rhythm guitars live; (2) The Weeknd, "Blinding Lights" — map the synth layers against the alley and note where width enters as the arrangement builds; (3) Billie Eilish, "bad guy" — the minimalist map: how few elements exist, how narrow the spine is, and where the rare wide moments sit. Under each map, write one sentence: what is this record's width plan saying? Keep all three maps — D1 builds your width constitution from them.

B2. 1963 versus now. ★ (30 min) Queue an early-Beatles stereo mix — "I Saw Her Standing There" or "Twist and Shout" works — and map it: the band massed on one side, the voices on the other, almost nothing between. Then map any 2020s chart pop track beside it. Now the experiment: fold both to mono (phone speaker counts) and log the verdicts. The sixty-year-old "gimmick" mix survives shockingly well — explain why using the ledger (what kind of width was that era's extremity built from?), and explain what each era's playback systems — living-room consoles and mono radios then, earbuds and phone speakers now — explain about each map. Case Study 1 is this exercise in essay form; do the listening before you read it.

B3. The phone-speaker census. (30 min) Five tracks you love plus your own current mix, played on an actual phone speaker at arm's length, in a real room. For each, log two columns: what shrank (acceptable — that's the deluxe illustrations staying behind) and what vanished or hollowed (structural — the comb came due). The professional tracks will lose sheen and almost nothing else; note the worst casualty in your own mix and its likely cause from the chapter's mistakes table. The gap between their column and yours is, as always, your to-do list.

B4. Hunt the Haas fakes. (25 min) One earbud in, one dangling — the most common mono playback on earth — and go hunting through your own library and a current-releases playlist. You're listening for the symptoms of time-domain width meeting a mono sum: elements that turn hollow and straw-like, watery flanged tones that swirl as the part moves, wide pads that thin to a whistle, doubled vocals that flam into a smear. When you catch one, verify: full stereo (gorgeous?), then mono fold (gone?). Log each suspect with the tool you think bought the width — Haas pair, widener, unison spread — and one line on whether the producer chose the tradeoff or, like Jaylen on Saturday, never folded it down at all.

B5. S-solo masterclass. (25 min) Open any utility or metering plugin that solos mid and side (Appendix E locates one in every major DAW) on two professional references in your genre. Listen to M solo first — the phone-speaker edition, hiding inside the stereo file — and confirm the song is all there. Then S solo, and inventory the gamble: reverb tails, doubles' edges, hat shimmer, pad texture — and essentially no kick, no bass, no snare, no lead vocal. Now run the same two solos on your own mix and write down everything structural you find squatting in S. Each squatter is a decision you haven't made yet.

B6. The power-alley census. (35 min) One track per decade, 1960s through 2020s — pick from your own library or your Chapter 4 references. For each, check the alley by ear: are kick, bass, snare, and lead vocal centered? Log the exceptions decade by decade. You'll watch the convention assemble itself across the 60s and 70s and then hold almost without exception — and the one era that violates it freely is the era when stereo was a showroom novelty and mono was the real product. Write the one-line conclusion: what do sixty years of converging pan maps tell you about who's been enforcing the alley — fashion, or playback systems?

B7. The bloom hunt. (20 min) Find three songs where the chorus audibly gets wider — shoulders-drop wider, not just louder. For each, identify the mechanism by ear: did the cast change (doubles, stacked harmonies, a pad entering at the edges — arrangement doing it free), or did something move (positions stretching, width swelling — a ride)? Count what enters at each chorus. Most of what you'll find is arrangement, which is the chapter's point: if every chorus needs the same "move," it's a part, not an automation pass.

Part C: 🎛️ DAW Lab

C1. The LCR rebuild. ★ (60–90 min) The chapter's centerpiece, run on your own track exactly as Jaylen ran it. (1) Strip: remove every widener, imager, and Haas duplicate you can't defend out loud; list what you deleted. (2) Zero: every pan knob to center, mono button on, thirty seconds of humility — the whole record in one column, terrible and honest. (3) Paper first: write the LCR plan before touching a knob — alley leases (kick, bass/808, snare, lead), hard seats (doubles, pairs, claps), placed seats with a written reason for each. (4) Execute the three-seat skeleton, still checking mono. (5) Earn the in-betweens: every position that leaves 0/100 gets its reason said out loud — the 35% test. (6) Re-touch faders: pan moves are balance moves; both worlds must tell the truth. (7) Save as a new version with the pan map in the session notes — and actually draw the map. This pan map persists; Chapter 30's diagnostic pass will ask for it.

C2. Double-width versus Haas, the A/B. ★ (40 min) One part, three builds, one verdict table. Take a rhythm part from your track and build: (A) the real thing — a second performance hard-panned opposite the first (or for programmed material, a genuinely different pattern, sample, or velocity pass per side); (B) the counterfeit — a bit-identical duplicate panned hard L/R; (C) the trick — the duplicate again, one side delayed 15–25 ms. A/B/C in stereo at matched loudness and be honest about how seductive C is. Then fold each to mono and complete the table: width heard in stereo / verdict in mono / correlation meter behavior. B is the trick entry — write one sentence on what you actually built (the meter already told you). Finish by writing the ledger's principle in your own words, taped where you can see it.

C3. Pan-law lab. (25 min) Find your DAW's pan-law setting (Appendix E knows where it hides) and write the current value in your session doc next to the sample rate. Then hear it: loop a mono drum loop, A/B center versus hard-left while watching your meters, in stereo and again through a mono fold. Log the level relationships you observe in each world. If your DAW lets you switch laws, audition one alternative on a scratch copy of the session to hear what changes — then put it back, and write the rule beneath it: pick a law once, never change it mid-mix.

C4. Correlation-meter session. ★ (30 min) Park a correlation meter (and goniometer, if you have one) on the 2-bus and play your whole mix, logging the needle's range per section. Healthy: living roughly +0.3 to +1, breathing toward 0 on wide moments. Then hunt: solo your buses one at a time until you find the lowest-correlation offender, and name what's causing it. Finally, the inoculation: on a scratch copy, flip the polarity of one channel of a stereo pad and watch the meter dive negative while the goniometer cloud lies down flat — thirty seconds of deliberately experiencing −1 so you recognize it instantly when a flipped cable or sample (Chapter 12's silent killer) sneaks one into a real session. Undo it. Leave the meter on the 2-bus forever; it costs nothing.

C5. The balance-knob audit. (15 min) Solo a stereo track with distinct left/right content — a stereo drum loop or a wide synth — and sweep its "pan" control slowly while listening for material dropping out rather than moving. If content vanishes, your DAW handed you a balance control: it's deleting a channel, not relocating an image. Find the real tool — dual-pan or a narrow-then-place utility (Appendix E) — and write it into your template notes. Two minutes of audit now beats discovering the missing shaker at mastering.

C6. Width automation drill. (30 min) Plan the bloom on paper first: a marker on the last bar before your chorus, annotated like Jaylen's ("CH: doubles in, pad +width, hats spread"). Then write exactly one experimental move tonight — hats easing from 20% to 45%, a pad's width or S level swelling, or, cheapest of all, confirming the arrangement already does it by unmuting doubles at the chorus. A/B the bloom at matched loudness, then run the anti-bloom check: fold the chorus to mono and verify the song's biggest moment doesn't get smaller on a phone. Keep or revert with a written verdict. The full ride craft arrives in Chapter 27 — tonight is the handshake, not the wedding.

C7. Bass-mono pass. (20 min) S-solo your mix and listen for low end leaking into the sides — bass in the gamble is the leak the club's mono subs will audit without mercy. If you hear it, insert a bass-mono ("mono-maker") utility on the offending bus or the 2-bus, start around 100–150 Hz, and set the final value by ear with the mono fold-down running: too low and the leak persists, too high and the mix's mids stiffen. A habit, not a law — but if you skip it, name which of the sidebar's three bills you're choosing to pay.

C8. The width-pass print. (20 min) Print two mixes: pre-width (your Chapter 24 state) and post-width (tonight's). Level-match them and listen on three systems — monitors, earbuds, phone speaker. Journal three specific differences in chapter vocabulary (seats, the alley, edges, the bloom, the fold) and one honest cost you can hear; there's always a cost, and naming it is the discipline. File both prints — Chapter 30's diagnostic pass wants the history, and Chapter 31 wants the headroom intact.

Part D: Synthesis & Critical Thinking

D1. Write your width constitution. (30 min) Lay your three B1 pan maps side by side with your genre's Chapter 18 conventions in mind, and extract the local laws: what does your lane weld to the center, what does it spread, how hard are its edges, where does the bloom live? Then write your own track's one-paragraph width constitution: where you'll comply, plus one deliberate violation you're choosing — with the tradeoff named honestly and the fold-down evidence that you've already paid for it.

D2. The mono-first argument. (20 min) Some engineers build the entire static balance in mono — Chapter 20 planted the habit — and only open the stereo field once the mix already works in one column. Write a half-page steelman of that workflow using this chapter's machinery (the fold tilt, the ledger, the doctrine), then the honest counter-case (edge decisions, headphone policies, and blooms can only be auditioned in stereo), and land on a stated policy for your own sessions. There's no wrong answer; there's only an undefended one.

D3. One song, three stages. (25 min) On paper only, write three complete width plans for your project track: 1963-extreme (everything committed to two or three seats, asymmetry embraced, mono as the real mix), modern wide-but-safe (the alley plus hard-panned support, the wedge, verified blooms), and podcast-narrow (Aisha's world — everything at or near center, separation by tone and level alone). For each: the pan map and one sentence on what the song now says. Conclude with which plan serves your song and what the exercise teaches about width as genre identity rather than engineering virtue.

D4. Template integration. (15 min) Bake tonight into your Chapter 6 template so every future mix starts with the verification infrastructure already wired: correlation meter on the 2-bus, a one-click mono switch on your monitoring path, a bass-mono utility parked (bypassed) on the BASS bus, and a pan-map field added to your session-notes file — with your DAW's pan law written at the top. One-line usage notes on each. Compounding interest, same as every template deposit since Chapter 6.

Part M: Mixed Practice

Interleaving keeps the old tools sharp while the new one is hot.

M1. (Chapter 21) Pan moves are balance moves. ★ (10 min) Chapter 21 taught that levels are relationships, not absolutes. Explain why the width pass must end with a fader re-touch: what pan law does to an element's contribution as it travels from center to edge, what the mono fold does to the same relationship a second time, and why "I'll just re-balance at the end" is this chapter's version of Chapter 21's headroom-is-a-workflow doctrine.

M2. (Chapter 22) Two knives for one clash. (10 min) Two rhythm guitars mask each other in the 200–400 Hz zone. Panning them apart "fixes" it instantly on speakers. Explain the two halves of why — which half is spatial release from masking (Chapter 4's cocktail-party machinery) and which playback systems it abandons — and why the EQ carve from Chapter 22 remains the mono-proof half of the fix. State the honest division of labor between the two knives in one sentence.

M3. (Chapter 12) The polarity flashback. (10 min) During C4 you manufactured −1 correlation on purpose. Now connect it to capture: explain how a miswired cable or a polarity-flipped sample from the Chapter 12 tracking stage shows up months later as a width-pass diagnosis, what the correlation meter and goniometer each display when it happens, and the check you'd run on a multi-mic'd drum kit before spreading it across the field.

M4. (Chapters 14 + 17) Designed width versus performed width. (15 min) The bloom pad got fixed inside the synth — fundamentals and sub center, upper unison voices spread — while the chorus vocals got fixed with hard-panned real doubles. Assign each fix to its family in the width ledger and explain why both survive the fold while Saturday's WIDE & HUGE preset didn't. Then apply it: name one element in your own track whose width should be re-designed at the source (Chapter 14's territory) and one that deserves a performed double (Chapter 17's), and do whichever takes under ten minutes.

M5. (Chapters 16 + 24) The two-axis seat audit. (15 min) Your stage is now two-dimensional: every element has a depth row (Chapter 24's map) and a width seat (tonight's). Pick five elements and write each one's full address — row plus seat. Then hunt for a contradiction: something wide but parked at the lip, or drenched in the back but welded dead center at full brightness. Resolve it with the cheapest coherent move — a send, a seat, or (Chapter 16's standing offer) a mute — and write one line on why the two axes have to agree for the "three-dimensional" illusion to hold.