diff --git a/docs/steamframe/PROGRESS.md b/docs/steamframe/PROGRESS.md
index e55b719..7c557ee 100644
--- a/docs/steamframe/PROGRESS.md
+++ b/docs/steamframe/PROGRESS.md
@@ -234,6 +234,38 @@
   (`steam://` URL) → own app key needed (option 2); our working directory and binary →
   enough.
 
+**Result on the Frame (2026-10-07, deploy with `ec82b5f`):** SteamVR accepts our manifest
+(no error) but keeps using Steam's entry for the key:
+`source: "steam" launch type: "url" working dir: PropertyNotSet binary: PropertyNotSet
+URL: "steam://launch/1009850/openvroverlay" auto-launch: true`.
+- **Consequence:** the native build needs its own app key (option 2, DESIGN.md 2a,
+  follow-up). Design pending.
+- **Side effect:** `--force-install-manifest` switched auto-launch on for Steam's key. At the
+  next SteamVR start, SteamVR may launch `steam://launch/1009850` (the uninstalled Steam
+  version). To be switched off again.
+- OVRAS itself was started by `install.sh` and keeps running (not yet checked in the
+  dashboard, T2).
+
+### Fix: debug output only with debugSymbolsAndLogs (2026-10-07)
+
+- **Problem:** the log filled with `[D] updateAllPulseData done.` about every 11 ms (8399
+  lines in 6 s). `AudioTabController::eventLoopTick()` reads the microphone's mute state on
+  every tick, and every read calls `updateAllPulseData()`
+  (`AudioManagerPulse_internal.h:312`).
+- **Cause (regression in `qt6`):** on `master` the message was easylogging's `LOG(DEBUG)`,
+  and the Debug level was disabled unless built with `debugSymbolsAndLogs`
+  (`ENABLE_DEBUG_LOGGING`). `qt6` switched to `qDebug()` and lost that; the constant
+  `debugLoggingEnabled` in `setup.cpp` was left unused, so all 46 `qDebug()` calls were
+  always active.
+- **Fix (`setup.cpp`, `setUpLogging()`):** without `ENABLE_DEBUG_LOGGING`,
+  `QLoggingCategory::setFilterRules("*.debug=false")`. `QT_LOGGING_RULES="*.debug=true"`
+  takes precedence and turns debug output on again without a rebuild.
+- **Result:** cross build and package succeed, `Qt_6_PRIVATE_API` without `QVulkan*`: 0.
+- **Not tested yet:** on the Frame (log without `[D]` lines; with `QT_LOGGING_RULES` with
+  them).
+- **Open for R6/T10:** each tick makes three synchronous PulseAudio queries (server info,
+  all sinks, all sources) for the mute state. Not changed now.
+
 ### Test checklist on the Frame (step 5)
 
 Deploy: `build_scripts/steamframe/deploy-to-frame.sh <user>@<frame>` (SteamVR running).
diff --git a/src/utils/setup.cpp b/src/utils/setup.cpp
index f1b7dd6..25504cc 100644
--- a/src/utils/setup.cpp
+++ b/src/utils/setup.cpp
@@ -1,6 +1,7 @@
 #include "setup.h"
 #include <QtLogging>
 #include <QtDebug>
+#include <QLoggingCategory>
 #ifdef ENABLE_DEBUG_LOGGING
 constexpr auto debugLoggingEnabled = true;
 #else
@@ -382,4 +383,13 @@ void setUpLogging()
     f = fopen( "AdvancedSettings.log", "a" );
     qSetMessagePattern("[%{if-debug}D%{endif}%{if-info}I%{endif}%{if-warning}W%{endif}%{if-critical}C%{endif}%{if-fatal}F%{endif}] %{time process}: %{message}");
     originalMessageHandler = qInstallMessageHandler( mainQtMessageHandler );
+    // Debug output only in builds with debugSymbolsAndLogs, as on master
+    // (easylogging's Debug level was disabled otherwise). Some qDebug() calls
+    // run on every tick (e.g. "updateAllPulseData done."). The environment
+    // variable QT_LOGGING_RULES="*.debug=true" takes precedence over this and
+    // turns them on again without a rebuild.
+    if constexpr ( !debugLoggingEnabled )
+    {
+        QLoggingCategory::setFilterRules( "*.debug=false" );
+    }
 }