A fourth aesthetic direction beyond the three knob variants — based
on the user's reference image (Moog/Roland/Korg vintage rack gear).
- Warm amber+charcoal palette (replaces the cyan phosphor accent).
- Beveled metal panels with corner screws (radial-gradient circles
with a slot mark).
- Knobs: brushed-metal radial gradient, knurled perimeter ridges,
specular highlight, white-warm engraved indicator, amber arc with
glow.
- LEDs for step cells: dim amber-off when inactive, full amber-on
with radial glow when active. Animated playhead outline at 8 Hz.
- Code "screen" with engraved-screen feel (inset shadow, faint amber
bloom). Status line "> RUNNING_" with blinking cursor.
- Engraved labels (small caps, double text-shadow for inset).
- Tabular numeric value displays in their own dark inset readouts
(LCD-style).
- Header buttons (STOP / RUN) with green run LED, pulsing red status.
Static mockup — no audio engine wired. Knobs are draggable to evaluate
the feel; step LEDs toggle on click. Decision pending: pick this or
one of A/B/C from knobs.html and align all surfaces to that language.
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