diff --git a/assets/disk0/COPYING b/assets/disk0/COPYING
index a4a775b..9ab80f4 100644
--- a/assets/disk0/COPYING
+++ b/assets/disk0/COPYING
@@ -1,19 +1,14 @@
 Copyright (c) 2020-2026 CuriousTorvald
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
\ No newline at end of file
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
diff --git a/terranmon.txt b/terranmon.txt
index 0e36167..23280ff 100644
--- a/terranmon.txt
+++ b/terranmon.txt
@@ -2868,7 +2868,18 @@ TODO:
                 at execApp (<eval>:1457:16)
                 at Object.execute (<eval>:893:38)
                 at <eval>:867:31
-        [ ] Timbres of Heaven's Overdriven Gt decays EXTREMELY SLOWLY even after the fix
+        [x] Timbres of Heaven's Overdriven Gt decays EXTREMELY SLOWLY even after the fix
+            * DONE 2026-06-15. Root cause (engine). Overdriven Gt becomes a 4-layer Metainstrument.
+              Layer children inherit the parent's key-off only via the per-tick background-voice sync
+              (AudioAdapter.kt:3782), which requires parent.active. With a fast fadeout (fo=1067 = 1-tick
+              cut), the foreground voice deactivates in the same tick KEY_OFF fires — before the sync runs —
+              so the children were detached as orphans that never picked up the release and kept looping at
+              the ~0.70 sustain until the next note. That's the "extremely slow decay"/ringing tail, and it's
+              ToH-specific because ToH leans on multi-layer presets with short releases.
+              Fix (AudioAdapter.kt, inactive-parent branch): inherit parent.keyOff/noteFading before
+              detaching, mirroring the existing active-branch. parent.keyOff survives deactivation and is
+              reset on retrigger, so a true value means this note was released. A parent that ended naturally
+              (no release) still leaves the child to finish on its own.
         [ ] Some ways to decouple Sample+Inst and patterns into separate files (tsvm-doom needs separate file access; samplepack can be uploaded once on init)
 
 TODO - list of demo songs that MUST ship with Microtone:
diff --git a/tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt b/tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
index 73d5b8a..10adc2b 100644
--- a/tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
+++ b/tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
@@ -3758,6 +3758,22 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
             if (bg.isLayerChild) {
                 val parent = ts.voices.getOrNull(bg.sourceChannel)
                 if (parent == null || !parent.active) {
+                    // Parent note ended: detach so this layer finishes its own release as a
+                    // plain ghost. But if the parent was RELEASED (key-off / note-fade) and its
+                    // own fadeout deactivated it in the SAME tick the release fired — a fast
+                    // fadeout, e.g. fo≈1067 (a 1-tick cut) — the parent-sync below never ran
+                    // while it was active, so the release was never carried across and a still
+                    // looping/sustaining child would ring on until the next note displaces it.
+                    // Inherit the parent's final release here before detaching (parent.keyOff /
+                    // noteFading survive deactivation; both are reset on retrigger, so a true
+                    // value means THIS note was released, not a stale flag). A parent that ended
+                    // without release (natural sample/env end) leaves the child to finish on its
+                    // own, unchanged. Symptom: long tails on multi-layer SF2 presets with a short
+                    // release, e.g. Timbres of Heaven's sustained guitars/organs.
+                    if (parent != null && !bg.keyOff && !bg.noteFading) {
+                        if (parent.keyOff) { bg.keyOff = true; applyKeyLift(bg, instruments[bg.instrumentId]) }
+                        else if (parent.noteFading) bg.noteFading = true
+                    }
                     bg.isLayerChild = false
                 } else {
                     bg.noteVal   = (parent.noteVal + bg.layerRelDetune).coerceIn(0x20, 0xFFFF)