diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5952782..61b9bb4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## 2026-04-01
 
+- **Track 12: The Observatory** — G minor, 112 BPM. Chapel through shortwave static. Square-wave organ, choir, saw arp, supersaw halo pad, theremin signal. Contributed by ChatGPT.
+- The Observatory: theremin louder (0.3), less reverb (0.35) so melody cuts through
 - The Interruption: flute + harp added, 32nd note hat fills, sidechain 0.6, stereo string quartet, delay on harpsichord/violins
 - Voltage: dotted delay on saw (spring) and pulse (taj_mahal), distortion on kick
 - **Track 11: Voltage** — F minor, 138 BPM. Raw oscillators only — sine sub (dry), saw lead (spring reverb), pulse counter-rhythm (taj_mahal). Rhythm from monophonic pitch shifts. Saw arp solo, pulse arp solo, 32nd note chaos peak. Kick maxed at 1.0.
diff --git a/tracks/the_observatory.py b/tracks/the_observatory.py
index 6ab20ad..dfaf404 100644
--- a/tracks/the_observatory.py
+++ b/tracks/the_observatory.py
@@ -316,9 +316,9 @@ for _ in range(8):
     hats.rest(Duration.WHOLE)
 
 # ── SIGNAL — the melody finally resolves the transmission ────────
-signal = score.part("signal", instrument="theremin", volume=0.16,
-                    reverb=0.82, reverb_type="taj_mahal",
-                    delay=0.28, delay_time=0.375, delay_feedback=0.32,
+signal = score.part("signal", instrument="theremin", volume=0.3,
+                    reverb=0.35, reverb_type="taj_mahal",
+                    delay=0.2, delay_time=0.375, delay_feedback=0.25,
                     humanize=0.05)
 
 # Bars 1-48: silence