As-built: brushed-aluminium/stainless case + 9V DC pedal jack (pedalboard-ready)

- Case: reskin the enclosure as a brushed-aluminium / stainless faceplate
  (metal sheen + brushed grain, chrome corner screws, dark engraved legends)
  instead of 3D-printed matte. The on-faceplate captions switch to the dark
  legend colour for contrast; I/O-strip labels stay light (they're on the dark
  recessed bay). BOM enclosure → die-cast aluminium (Hammond 1590-style) /
  folded stainless.
- Power: add a standard 9 V DC pedal jack (2.1 mm centre-negative) so it drops
  straight onto a pedalboard, alongside USB-C (which still powers it on a desk
  and carries config). BOM adds the jack + 9 V→5 V buck + reverse-polarity
  protection. Total ≈ $59.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

player-asbuilt.html

@@ -19,7 +19,9 @@
     • rear I/O: external trigger in (footswitch), a 1/4" instrument pass-through
       with the click mixed in the ANALOG domain (DAC → summing op-amp → balanced
       line driver), a shared 1/4" balanced-TRS main out, plus an analog monitor
-      amp + speaker, USB-C and a PWR LED, in a compact matte case.
+      amp + speaker. Powered from a standard 9 V DC pedal jack (2.1 mm centre-
+      negative, pedalboard-friendly) or USB-C (also carries config), in a brushed
+      aluminium / stainless enclosure.
   A rough bill of materials for all of this is shown below the loader on the page.
   Compare with the idealized /player.html. One file, no deps; shares src/engine.js.
 -->
@@ -38,8 +40,9 @@
     --bg1:#12151c; --bg2:#05070a;
     --txt:#c7d0db; --muted:#7f8b9a; --link:#6cb6ff;
     --panel-bg:#171b22; --panel-bd:#2a313c; --field-bg:#0e1116; --field-bd:#222a36;
-    /* device — fixed matte hardware in both themes */
+    /* device — brushed-aluminium / stainless faceplate (fixed in both themes);
-    --case:#22262e; --case2:#15181d; --device-bd:#0b0d11; --silk:#9aa6b2;
+       --silk is the dark engraved legend colour on the metal */
+    --case:#a9afb7; --case2:#878e98; --device-bd:#5a616b; --silk:#2f343b;
     --pcb:#0d2620; --oled-bezel:#04060a; --metal:#3a424e;
   }
   :root[data-theme="light"]{
@@ -61,17 +64,17 @@
     padding:3px 9px; font-size:14px; line-height:1; cursor:pointer }
   .tbtn:hover{ color:var(--txt) }
 
-  /* ---- the device: matte 3D-printed case ---- */
+  /* ---- the device: brushed-aluminium / stainless faceplate ---- */
   .device{
     width:100%; max-width:380px; position:relative;
     background:
-      repeating-linear-gradient(115deg, rgba(255,255,255,.012) 0 2px, transparent 2px 4px),
+      repeating-linear-gradient(90deg, rgba(255,255,255,.07) 0 1px, rgba(0,0,0,.05) 1px 3px),   /* brushed grain */
-      linear-gradient(180deg, var(--case), var(--case2));
+      linear-gradient(158deg, #bcc2ca 0%, #969da7 46%, #aeb4bd 60%, #848b95 100%);                /* metal sheen */
-    border:1px solid var(--device-bd); border-radius:18px; padding:16px 14px 14px;
+    border:1px solid var(--device-bd); border-radius:13px; padding:16px 14px 14px;
-    box-shadow:0 24px 55px rgba(0,0,0,.55), inset 0 1px 0 rgba(255,255,255,.05), inset 0 -2px 10px rgba(0,0,0,.6);
+    box-shadow:0 22px 50px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.55), inset 0 -2px 8px rgba(0,0,0,.28);
   }
   .device::before, .device::after, .device .screw{ content:""; position:absolute; width:10px; height:10px; border-radius:50%;
-    background:radial-gradient(circle at 35% 30%, #5a626e, #1a1e24 70%); box-shadow:inset 0 0 2px #000, 0 1px 1px rgba(0,0,0,.5); }
+    background:radial-gradient(circle at 36% 30%, #f0f2f5, #8b929b 60%, #5b626b 100%); box-shadow:inset 0 0 2px rgba(0,0,0,.4), 0 1px 1px rgba(0,0,0,.3); }
   .device::before{ top:12px; left:12px } .device::after{ top:12px; right:12px }
   .screw.bl{ bottom:12px; left:12px } .screw.br{ bottom:12px; right:12px }
 
@@ -88,10 +91,10 @@
     box-shadow:inset 0 0 0 2px #15181d, inset 0 0 0 3px #000, 0 3px 9px rgba(0,0,0,.55) }
   #tft{ display:block; width:320px; height:240px; max-width:100%; border-radius:4px; background:#06080c;
     box-shadow:0 0 0 1px #000, inset 0 0 18px rgba(0,0,0,.45) }
-  .tft-cap{ text-align:center; font-size:10px; color:var(--muted); margin-top:7px; letter-spacing:.02em }
+  .tft-cap{ text-align:center; font-size:10px; color:var(--silk); opacity:.8; margin-top:7px; letter-spacing:.02em }
 
   /* small caption under the screen / I/O (the beat indicator lives on the TFT now) */
-  .ledbar-cap{ text-align:center; font-size:10px; color:var(--muted); margin:2px 0 0; letter-spacing:.02em }
+  .ledbar-cap{ text-align:center; font-size:10px; color:var(--silk); opacity:.8; margin:2px 0 0; letter-spacing:.02em }
 
   /* side-by-side: player on the left, BOM on the right (stacks when narrow) */
   .cols{ display:flex; flex-wrap:wrap; align-items:flex-start; justify-content:center; gap:18px; width:100% }
@@ -134,8 +137,9 @@
   .jack{ flex:1; display:flex; flex-direction:column; align-items:center; gap:5px }
   .jack i{ width:20px; height:20px; border-radius:50%; background:radial-gradient(circle at 40% 34%, #333a44, #07090c 72%);
     border:2px solid #5b6470; box-shadow:inset 0 0 4px #000 }
-  .jack b{ font-size:7.5px; font-weight:700; color:var(--silk); letter-spacing:.05em; text-transform:uppercase; opacity:.85; text-align:center; line-height:1.3 }
+  .jack b{ font-size:7.5px; font-weight:700; color:#8f9aa6; letter-spacing:.05em; text-transform:uppercase; opacity:.9; text-align:center; line-height:1.3 }
   .jack.usb i{ width:24px; height:10px; border-radius:4px; border:2px solid #5b6470; background:#07090c; margin-top:5px }
+  .jack.dc i{ background:radial-gradient(circle, #6b7480 0 2.5px, #0a0d11 3.5px 72%) }   /* DC barrel: centre pin */
 
   /* ---- load panel (same as the other pages) ---- */
   .panel{ width:100%; max-width:380px; background:var(--panel-bg); border:1px solid var(--panel-bd); border-radius:14px; padding:16px }
@@ -211,9 +215,10 @@
     <div class="jack" title="External trigger in — footswitch to start/stop or tap tempo"><i></i><b>Trig In</b></div>
     <div class="jack" title="Instrument in — 1/4&quot; pass-through; the click is mixed into your signal"><i></i><b>Inst In</b></div>
     <div class="jack" title="Main out — 1/4&quot; balanced TRS (instrument + click); the shared output plug"><i></i><b>Out TRS</b></div>
+    <div class="jack dc" title="9 V DC in — standard 2.1 mm centre-negative pedal power; drop it on your pedalboard"><i></i><b>9V DC</b></div>
     <div class="jack usb" title="USB-C — power &amp; set-list transfer"><i></i><b>USB-C</b></div>
   </div>
-  <div class="ledbar-cap">Trig in · 1/4″ inst pass‑through (click injected) · shared 1/4″ balanced‑TRS out</div>
+  <div class="ledbar-cap">Trig in · 1/4″ inst pass‑through (click injected) · shared 1/4″ balanced‑TRS out · 9 V DC or USB‑C power</div>
 </div>
 
 <!-- ===================== LOAD CONFIG ===================== -->
@@ -236,7 +241,7 @@
 <!-- ===================== BILL OF MATERIALS ===================== -->
 <div class="panel bom-panel">
   <h2>Bill of materials</h2>
-  <p class="sub">Rough parts list for the device above — a USB‑C‑powered RP2040 build with analog click injection.
+  <p class="sub">Rough parts list for the device above — a pedalboard‑friendly RP2040 build (9 V DC or USB‑C) with analog click injection.
     Ballpark one-off prices (USD); cheaper at volume.</p>
   <table class="bom">
     <thead><tr><th>Part</th><th class="q">Qty</th><th class="c">~$</th></tr></thead>
@@ -256,11 +261,12 @@
       <tr class="grp"><td colspan="3">Connectors &amp; power</td></tr>
       <tr><td class="part">1/4″ jack <span class="spec">— Inst In (TS) · Out (TRS) · Trig In (TS)</span></td><td class="q">3</td><td class="c">3</td></tr>
       <tr><td class="part">USB‑C bus power (5 V) + PWR LED <span class="spec">— same port carries config; no battery</span></td><td class="q">1</td><td class="c">1</td></tr>
+      <tr><td class="part">9 V DC pedal jack (2.1 mm centre‑neg) + 9 V→5 V buck + reverse‑polarity protect <span class="spec">— pedalboard power</span></td><td class="q">1</td><td class="c">3</td></tr>
       <tr class="grp"><td colspan="3">Build</td></tr>
       <tr><td class="part">Custom PCB (or perfboard)</td><td class="q">1</td><td class="c">5</td></tr>
       <tr><td class="part">Passives, headers, wire <span class="spec">— R/C for the analog stage + decoupling</span></td><td class="q">—</td><td class="c">3</td></tr>
-      <tr><td class="part">3D‑printed enclosure + screws / standoffs</td><td class="q">1</td><td class="c">5</td></tr>
+      <tr><td class="part">Die‑cast aluminium enclosure (Hammond 1590‑style) — or folded stainless <span class="spec">— pedal‑grade</span></td><td class="q">1</td><td class="c">12</td></tr>
-      <tr class="total"><td>Total (one‑off)</td><td class="q"></td><td class="c">≈ $49</td></tr>
+      <tr class="total"><td>Total (one‑off)</td><td class="q"></td><td class="c">≈ $59</td></tr>
     </tbody>
   </table>
   <p class="sub" style="margin-top:12px">Audio is summed in the <b>analog domain</b>: the DAC's click is mixed with a high‑impedance