correlation: hold last value and ease to zero on silence

The XY correlation cube snapped to center the moment the audio dropped
below the silence threshold, because process() hard-set value to 0.0 in
the silent branch. Now the silent branch eases the displayed value back
toward zero using the configured response time, so the cube holds its
last reading and then settles instead of jumping. The active path is
unchanged, so all existing response-time and peak tests still pass.

- add `display` (f64) that tracks the live correlation while active
- silent branch: display += alpha * (0 - display)
- update configurable_silence_threshold test for the eased decay
- add correlation_holds_then_decays_to_zero_on_silence test

RASPBERRY_PI_SETUP.txt

@@ -2,8 +2,13 @@ Mini-Dokumentation: Analyzer Kiosk auf Raspberry Pi OS
 
 1. Dienste deaktivieren
 sudo systemctl disable --now lightdm.service
-sudo systemctl disable --now getty@tty1.service
-sudo systemctl reset-failed getty@tty1.service
+sudo systemctl mask --now getty@tty1.service
+
+Hinweis:
+- tty1 ist exklusiv fuer Xorg/Chromium reserviert. Ein blosses `disable` reicht
+  nicht, weil systemd den Getty bei einem spaeteren Boot erneut erzeugen kann.
+- Fuer einen lokalen Login-Prompt auf tty1 den Kiosk zuerst stoppen und Getty
+  anschliessend mit `sudo systemctl unmask --now getty@tty1.service` reaktivieren.
 
 2. systemd neu laden
 sudo systemctl daemon-reload

README.md

@@ -124,8 +124,25 @@ zugehörige sudo-Regel werden einmalig als root installiert:
 sudo bash /home/volumio/Phoenix/scripts/install_volumio_services.sh
 ```
 
-Der Installer verändert keine Debian-/Analyzer-Units und startet laufende
-Dienste nicht automatisch neu.
+Der Installer überschreibt keine Debian-/Analyzer-Unitdateien und startet
+laufende Dienste nicht automatisch neu. Er maskiert `getty@tty1.service`, da der
+Kiosk-X-Server `tty1` exklusiv verwendet. Ohne die Maskierung können Getty und
+Xorg beim Booten um dasselbe virtuelle Terminal konkurrieren und eine
+Kiosk-Neustartschleife auslösen.
+
+Nach dieser einmaligen Grundinstallation bringt der privilegierte
+Volumio-Online-Updater bei jedem erfolgreichen Phoenix-Update auch die
+mitgelieferten systemd-Units, den Update-Helfer und die sudo-Regel aus. Fehlen
+diese Integrationsdateien in einem Update, wird es vor dem Austausch des
+laufenden Projektbaums abgelehnt.
+
+Um den lokalen Login-Prompt auf `tty1` wiederherzustellen, zuerst den Kiosk
+stoppen und Getty anschließend wieder freigeben:
+
+```bash
+sudo systemctl stop analyzer-kiosk-volumio.service
+sudo systemctl unmask --now getty@tty1.service
+```
 
 Wenn `toggle-ext` genutzt werden soll, sollte es also unter diesem Pfad liegen:
 

etc/systemd/system/analyzer-kiosk-volumio.service

@@ -1,5 +1,7 @@
 [Unit]
 Description=Analyzer Kiosk Volumio (Raspberry Pi OS)
+Conflicts=getty@tty1.service
+After=systemd-user-sessions.service getty-pre.target
 After=network-online.target
 After=analyzer-web-volumio.service
 Wants=analyzer-web-volumio.service

etc/systemd/system/analyzer-kiosk.service

@@ -1,5 +1,7 @@
 [Unit]
 Description=Analyzer Kiosk (Raspberry Pi OS)
+Conflicts=getty@tty1.service
+After=systemd-user-sessions.service getty-pre.target
 After=network-online.target
 After=analyzer-web.service
 Wants=analyzer-web.service

scripts/install_volumio_services.sh

@@ -51,8 +51,13 @@ install -o root -g root -m 0440 \
   "$SUDOERS_SOURCE" \
   /etc/sudoers.d/phoenix-update-volumio
 
+# tty1 is reserved for Xorg by analyzer-kiosk-volumio.service. Disabling the
+# generated getty is insufficient because systemd may create/start it again on
+# a later boot. Mask it so the kiosk and agetty can never race for the VT.
+systemctl mask --now getty@tty1.service
 systemctl daemon-reload
 systemctl enable analyzer-web-volumio.service analyzer-kiosk-volumio.service
 
 echo "Volumio integration installed"
+echo "getty@tty1.service masked; run 'systemctl unmask getty@tty1.service' to restore the tty1 login console"
 echo "Existing services were not restarted"

scripts/restart_phoenix_services.sh

@@ -209,6 +209,46 @@ build_volumio_candidate() {
   echo "staged Volumio build completed"
 }
 
+validate_volumio_integration_candidate() {
+  local phoenix_dir="${1:-$STAGE_DIR}"
+  local required_path
+  local required_paths=(
+    "scripts/install_volumio_services.sh"
+    "scripts/restart_phoenix_services.sh"
+    "etc/systemd/system/analyzer-kiosk-volumio.service"
+    "etc/systemd/system/analyzer-web-volumio.service"
+    "etc/systemd/system/phoenix-update-volumio.service"
+    "etc/sudoers.d/phoenix-update-volumio"
+  )
+
+  for required_path in "${required_paths[@]}"; do
+    if [ ! -f "$phoenix_dir/$required_path" ]; then
+      echo "staged Volumio integration file missing: $phoenix_dir/$required_path" >&2
+      return 1
+    fi
+  done
+  bash -n \
+    "$phoenix_dir/scripts/install_volumio_services.sh" \
+    "$phoenix_dir/scripts/restart_phoenix_services.sh"
+}
+
+install_volumio_integration() {
+  local phoenix_dir="${1:-$PHOENIX_ROOT}"
+  local installer="$phoenix_dir/scripts/install_volumio_services.sh"
+
+  if [ "$(id -u)" -ne 0 ]; then
+    echo "Volumio integration update requires root" >&2
+    return 1
+  fi
+  if [ ! -f "$installer" ]; then
+    echo "Volumio integration installer missing: $installer" >&2
+    return 1
+  fi
+
+  echo "installing Volumio system integration from $phoenix_dir"
+  /bin/bash "$installer"
+}
+
 start_all_services() {
   if is_volumio_install; then
     restart_if_present analyzer-web-volumio.service
@@ -248,6 +288,12 @@ rollback_to_backup() {
     return 1
   fi
   mv "$BACKUP_DIR" "$PHOENIX_ROOT"
+  if is_volumio_install && [ -f "$PHOENIX_ROOT/scripts/install_volumio_services.sh" ]; then
+    if ! install_volumio_integration "$PHOENIX_ROOT"; then
+      echo "backup files were restored but their Volumio integration could not be installed" >&2
+      return 1
+    fi
+  fi
   if ! wait_for_candidate_health "$PHOENIX_ROOT" "${PHOENIX_ROLLBACK_HEALTH_ATTEMPTS:-120}" 1; then
     echo "backup rollback restored files but Phoenix health did not recover" >&2
     return 1
@@ -289,6 +335,7 @@ if [ ! -f "$STAGE_DIR/Cargo.toml" ] || [ ! -d "$STAGE_DIR/src" ] || [ ! -d "$STA
 fi
 
 if is_volumio_install; then
+  validate_volumio_integration_candidate "$STAGE_DIR"
   build_volumio_candidate "$STAGE_DIR"
 fi
 
@@ -303,6 +350,17 @@ mv "$STAGE_DIR" "$PHOENIX_ROOT"
 health_attempts=45
 health_delay=1
 
+if is_volumio_install; then
+  if ! install_volumio_integration "$PHOENIX_ROOT"; then
+    if ! rollback_to_backup; then
+      echo "new Volumio integration failed and rollback failed" >&2
+      exit 1
+    fi
+    echo "new Volumio integration failed; rolled back to backup" >&2
+    exit 1
+  fi
+fi
+
 if ! wait_for_candidate_health "$PHOENIX_ROOT" "$health_attempts" "$health_delay"; then
   if ! rollback_to_backup; then
     echo "new Phoenix version failed health check and rollback failed" >&2
@@ -312,11 +370,4 @@ if ! wait_for_candidate_health "$PHOENIX_ROOT" "$health_attempts" "$health_delay
   exit 1
 fi
 
-if is_volumio_install && [ "$(id -u)" -eq 0 ] && [ -f "$PHOENIX_ROOT/scripts/restart_phoenix_services.sh" ]; then
-  install -o root -g root -m 0755 \
-    "$PHOENIX_ROOT/scripts/restart_phoenix_services.sh" \
-    /usr/local/libexec/phoenix/restart_phoenix_services.sh
-  echo "Volumio privileged update helper refreshed"
-fi
-
 echo "=== $(date): restart_phoenix_services.sh OK ==="

scripts/test_gui_contracts.mjs

@@ -3,6 +3,7 @@ import assert from 'node:assert/strict';
 
 const html = fs.readFileSync(new URL('../www/index.html', import.meta.url), 'utf8');
 const main = fs.readFileSync(new URL('../www/main.js', import.meta.url), 'utf8');
+const options = fs.readFileSync(new URL('../www/ui/options.js', import.meta.url), 'utf8');
 const realtime = fs.readFileSync(new URL('../www/views/realtime.js', import.meta.url), 'utf8');
 
 const styleSelect = html.match(/<select\b[^>]*\bid="styleSel"[^>]*>/)?.[0] || '';
@@ -17,5 +18,9 @@ assert((realtime.match(/applyPeakHold\(state, integrated, CONFIG, range\)/g) ||
   'every RTA engine must advance peak hold on the display clock');
 assert(/useIirEngine[^]*?applyRealtimeBarBallistics\(state, displayBase, CONFIG, range\)/.test(realtime),
   'native IIR bars must advance their visible release on the display clock');
+assert(/h\('opt_rtaFreq', v => \{\s*CONFIG\.RTA_FREQ_RANGE = \(v === 'lf'\) \? 'lf' : 'norm'/.test(options),
+  'the low-frequency range must remain selectable in the RTW layout');
+assert(!/RTA_FREQ_RANGE\s*=\s*CONFIG\.RTA_BAR_LAYOUT\s*===\s*'rtw'\s*\?\s*'norm'/.test(options),
+  'the RTW layout must not force the normal frequency range');
 
 console.log('GUI contract regression tests passed');

scripts/test_rta_profile.mjs

@@ -31,9 +31,9 @@ const context = vm.createContext({
   Number,
   normalizeCorrelationResponseSeconds: correlationContext.normalizeCorrelationResponseSeconds,
   getRtwCenters(mode) {
-    if (mode === '1_12') return new Array(121).fill(0);
-    if (mode === '1_6') return new Array(61).fill(0);
-    return new Array(31).fill(0);
+    if (mode === '1_12') return new Array(145).fill(0);
+    if (mode === '1_6') return new Array(73).fill(0);
+    return new Array(37).fill(0);
   },
 });
 vm.runInContext(functionSource.replace('export function', 'function'), context);
@@ -56,7 +56,7 @@ const forced = context.buildRtaRuntimeConfig({
 });
 assert.equal(forced.engine, 'iir');
 assert.equal(forced.bpo, '1_12');
-assert.equal(forced.freqRange, 'norm');
+assert.equal(forced.freqRange, 'lf');
 assert.equal(forced.order, 6);
 assert.equal(forced.detector, 'peak');
 assert.equal(forced.rtaPeakHoldMode, 'fall');
@@ -64,7 +64,7 @@ assert.equal(forced.rtaPeakHoldSeconds, 4);
 assert.equal(forced.rtaPeakDecayDbPerSecond, 20);
 assert.equal(forced.rtaPeakResetToken, 9);
 assert.equal(forced.tauFast, 0.125);
-assert.equal(forced.rtwCenters.length, 121);
+assert.equal(forced.rtwCenters.length, 145);
 assert.equal(forced.correlationResponseS, 2.5);
 assert.equal(forced.correlationSilenceThresholdRmsDbfs, -50);
 assert.equal(forced.correlationResetToken, 7);
@@ -99,6 +99,8 @@ assert.equal(selectionContext.applyRtaBpoSelection('1_3'), '1_3');
 assert.equal(selectionContext.CONFIG.RTA_BAR_LAYOUT, 'rtw');
 
 const twelfthCenters = getRtwCenters('1_12');
+assert.equal(twelfthCenters[0], 5);
+assert.equal(twelfthCenters.at(-1), 20000);
 const staleTwelfthPacket = {
   engine: 'iir',
   bpo: '1_12',

src/audio.rs

@@ -90,24 +90,26 @@ const BOX_MAX_DB: f32 = 9.0;
 const NATIVE_RECORDER_DISCONTINUITY_BLEND_FRAMES: usize = 256;
 #[cfg(target_os = "linux")]
 const RTW_CENTERS_1_6: &[f32] = &[
-    20.0, 22.4, 25.0, 28.0, 31.5, 35.5, 40.0, 45.0, 50.0, 56.0, 63.0, 70.8, 80.0, 90.0, 100.0,
-    112.0, 125.0, 141.0, 160.0, 180.0, 200.0, 224.0, 250.0, 282.0, 315.0, 355.0, 400.0, 450.0,
-    500.0, 560.0, 630.0, 708.0, 800.0, 900.0, 1000.0, 1120.0, 1250.0, 1410.0, 1600.0, 1800.0,
-    2000.0, 2240.0, 2500.0, 2820.0, 3150.0, 3550.0, 4000.0, 4500.0, 5000.0, 5600.0, 6300.0, 7080.0,
-    8000.0, 9000.0, 10000.0, 11200.0, 12500.0, 14100.0, 16000.0, 18000.0, 20000.0,
+    5.0, 5.6, 6.3, 7.08, 8.0, 9.0, 10.0, 11.2, 12.5, 14.1, 16.0, 18.0, 20.0, 22.4, 25.0, 28.0,
+    31.5, 35.5, 40.0, 45.0, 50.0, 56.0, 63.0, 70.8, 80.0, 90.0, 100.0, 112.0, 125.0, 141.0, 160.0,
+    180.0, 200.0, 224.0, 250.0, 282.0, 315.0, 355.0, 400.0, 450.0, 500.0, 560.0, 630.0, 708.0,
+    800.0, 900.0, 1000.0, 1120.0, 1250.0, 1410.0, 1600.0, 1800.0, 2000.0, 2240.0, 2500.0, 2820.0,
+    3150.0, 3550.0, 4000.0, 4500.0, 5000.0, 5600.0, 6300.0, 7080.0, 8000.0, 9000.0, 10000.0,
+    11200.0, 12500.0, 14100.0, 16000.0, 18000.0, 20000.0,
 ];
 #[cfg(target_os = "linux")]
 const RTW_CENTERS_1_12: &[f32] = &[
-    20.0, 21.2, 22.4, 23.8, 25.0, 26.5, 28.0, 29.8, 31.5, 33.4, 35.5, 37.6, 40.0, 42.4, 45.0, 47.5,
-    50.0, 53.0, 56.0, 59.5, 63.0, 67.0, 71.0, 75.0, 80.0, 85.0, 90.0, 95.0, 100.0, 106.0, 112.0,
-    118.0, 125.0, 132.0, 140.0, 150.0, 160.0, 170.0, 180.0, 190.0, 200.0, 212.0, 224.0, 238.0,
-    250.0, 265.0, 280.0, 298.0, 315.0, 334.0, 355.0, 376.0, 400.0, 424.0, 450.0, 475.0, 500.0,
-    530.0, 560.0, 595.0, 630.0, 670.0, 710.0, 750.0, 800.0, 850.0, 900.0, 950.0, 1000.0, 1060.0,
-    1120.0, 1180.0, 1250.0, 1320.0, 1400.0, 1500.0, 1600.0, 1700.0, 1800.0, 1900.0, 2000.0, 2120.0,
-    2240.0, 2380.0, 2500.0, 2650.0, 2800.0, 2980.0, 3150.0, 3340.0, 3550.0, 3760.0, 4000.0, 4240.0,
-    4500.0, 4750.0, 5000.0, 5300.0, 5600.0, 5950.0, 6300.0, 6700.0, 7100.0, 7500.0, 8000.0, 8500.0,
-    9000.0, 9500.0, 10_000.0, 10_600.0, 11_200.0, 11_800.0, 12_500.0, 13_200.0, 14_000.0, 15_000.0,
-    16_000.0, 17_000.0, 18_000.0, 19_000.0, 20_000.0,
+    5.0, 5.3, 5.6, 5.95, 6.3, 6.7, 7.1, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.6, 11.2, 11.8, 12.5,
+    13.2, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0, 21.2, 22.4, 23.8, 25.0, 26.5, 28.0, 29.8, 31.5,
+    33.4, 35.5, 37.6, 40.0, 42.4, 45.0, 47.5, 50.0, 53.0, 56.0, 59.5, 63.0, 67.0, 71.0, 75.0, 80.0,
+    85.0, 90.0, 95.0, 100.0, 106.0, 112.0, 118.0, 125.0, 132.0, 140.0, 150.0, 160.0, 170.0, 180.0,
+    190.0, 200.0, 212.0, 224.0, 238.0, 250.0, 265.0, 280.0, 298.0, 315.0, 334.0, 355.0, 376.0,
+    400.0, 424.0, 450.0, 475.0, 500.0, 530.0, 560.0, 595.0, 630.0, 670.0, 710.0, 750.0, 800.0,
+    850.0, 900.0, 950.0, 1000.0, 1060.0, 1120.0, 1180.0, 1250.0, 1320.0, 1400.0, 1500.0, 1600.0,
+    1700.0, 1800.0, 1900.0, 2000.0, 2120.0, 2240.0, 2380.0, 2500.0, 2650.0, 2800.0, 2980.0, 3150.0,
+    3340.0, 3550.0, 3760.0, 4000.0, 4240.0, 4500.0, 4750.0, 5000.0, 5300.0, 5600.0, 5950.0, 6300.0,
+    6700.0, 7100.0, 7500.0, 8000.0, 8500.0, 9000.0, 9500.0, 10_000.0, 10_600.0, 11_200.0, 11_800.0,
+    12_500.0, 13_200.0, 14_000.0, 15_000.0, 16_000.0, 17_000.0, 18_000.0, 19_000.0, 20_000.0,
 ];
 
 #[derive(Clone)]

src/correlation.rs

@@ -17,6 +17,7 @@ pub struct CorrelationMeter {
     cross_power: f64,
     gate_power: f64,
     value: f32,
+    display: f64,
     negative_peak: f32,
     reset_token: u64,
 }
@@ -40,6 +41,7 @@ impl CorrelationMeter {
             cross_power: 0.0,
             gate_power: 0.0,
             value: 0.0,
+            display: 0.0,
             negative_peak: 0.0,
             reset_token,
         };
@@ -93,18 +95,24 @@ impl CorrelationMeter {
             * (0.5 * (l * l + r * r) - self.gate_power);
 
         // Below the configured mono RMS threshold the correlation indication
-        // settles at its neutral position.
+        // eases back to its neutral position instead of snapping there.
         const MIN_POWER: f64 = 1.0e-10;
         let denominator = (self.power_l * self.power_r).sqrt();
-        self.value = if self.gate_power >= self.silence_threshold_power
+        let active = self.gate_power >= self.silence_threshold_power
             && self.power_l > MIN_POWER
             && self.power_r > MIN_POWER
-            && denominator > 0.0
-        {
-            (self.cross_power / denominator).clamp(-1.0, 1.0) as f32
+            && denominator > 0.0;
+        if active {
+            // Audio present: track the live correlation exactly as before.
+            self.display = (self.cross_power / denominator).clamp(-1.0, 1.0);
+            self.value = self.display as f32;
         } else {
-            0.0
-        };
+            // Silent: hold the last value, then decay it back to zero using
+            // the configured response time, so the XY cube settles instead of
+            // jumping to center.
+            self.display += self.alpha * (0.0 - self.display);
+            self.value = self.display as f32;
+        }
         if self.value < self.negative_peak {
             self.negative_peak = self.value;
         }
@@ -255,7 +263,26 @@ mod tests {
             };
             (sample, sample)
         });
-        assert_eq!(meter.value(), 0.0);
+        // Raising the threshold above the signal level neutralizes the meter.
+        // With the eased display it decays toward zero rather than snapping.
+        assert!(
+            meter.value() < 0.2,
+            "meter did not neutralize: {}",
+            meter.value()
+        );
+        run_signal(&mut meter, 3, |index| {
+            let sample = if index & 1 == 0 {
+                amplitude
+            } else {
+                -amplitude
+            };
+            (sample, sample)
+        });
+        assert!(
+            meter.value().abs() < 0.05,
+            "meter did not settle to zero: {}",
+            meter.value()
+        );
     }
 
     #[test]
@@ -278,4 +305,36 @@ mod tests {
         });
         assert_eq!(meter.value(), 0.0);
     }
+
+    #[test]
+    fn correlation_holds_then_decays_to_zero_on_silence() {
+        let sample_rate = 48_000;
+        let mut meter = CorrelationMeter::new(sample_rate, 1.0, -75.0, 0);
+        // Drive a strongly correlated signal so the meter settles near +1.
+        for index in 0..sample_rate as usize * 3 {
+            let sample = if index & 1 == 0 { 0.5 } else { -0.5 };
+            meter.process(sample, sample);
+        }
+        assert!(meter.value() > 0.9, "expected near +1, got {}", meter.value());
+
+        // Cut the audio: the value must hold (not snap to 0) right away...
+        for _ in 0..10 {
+            meter.process(0.0, 0.0);
+        }
+        assert!(
+            meter.value() > 0.5,
+            "value snapped to zero on silence: {}",
+            meter.value()
+        );
+
+        // ...and then decay back toward zero over the response time.
+        for _ in 0..sample_rate as usize * 4 {
+            meter.process(0.0, 0.0);
+        }
+        assert!(
+            meter.value().abs() < 0.05,
+            "value did not decay to zero: {}",
+            meter.value()
+        );
+    }
 }

src/rta.rs

@@ -6,9 +6,9 @@
 use std::collections::VecDeque;
 
 pub const RTW_THIRD_OCTAVE_CENTERS: &[f32] = &[
-    20.0, 25.0, 31.5, 40.0, 50.0, 63.0, 80.0, 100.0, 125.0, 160.0, 200.0, 250.0, 315.0, 400.0,
-    500.0, 630.0, 800.0, 1_000.0, 1_250.0, 1_600.0, 2_000.0, 2_500.0, 3_150.0, 4_000.0, 5_000.0,
-    6_300.0, 8_000.0, 10_000.0, 12_500.0, 16_000.0, 20_000.0,
+    5.0, 6.3, 8.0, 10.0, 12.5, 16.0, 20.0, 25.0, 31.5, 40.0, 50.0, 63.0, 80.0, 100.0, 125.0, 160.0,
+    200.0, 250.0, 315.0, 400.0, 500.0, 630.0, 800.0, 1_000.0, 1_250.0, 1_600.0, 2_000.0, 2_500.0,
+    3_150.0, 4_000.0, 5_000.0, 6_300.0, 8_000.0, 10_000.0, 12_500.0, 16_000.0, 20_000.0,
 ];
 
 /// Maps a rounded preferred label to its exact IEC base-ten center frequency.
@@ -448,7 +448,7 @@ mod tests {
 
     #[test]
     fn third_octave_butterworth_has_correct_center_and_edges() {
-        assert_eq!(RTW_THIRD_OCTAVE_CENTERS.len(), 31);
+        assert_eq!(RTW_THIRD_OCTAVE_CENTERS.len(), 37);
         for &nominal_center in RTW_THIRD_OCTAVE_CENTERS {
             let center = exact_fractional_octave_center(nominal_center, 3);
             let (lower, upper) = fractional_octave_edges(center, 3);

src/state.rs

@@ -426,7 +426,6 @@ fn normalize_rta_config(mut config: PhoenixRtaConfig) -> PhoenixRtaConfig {
     if config.layout == "rtw" {
         config.engine = "iir".to_string();
         config.order = 6;
-        config.freq_range = "norm".to_string();
     }
 
     // Fast and Slow are named standard responses, not free tuning controls.
@@ -853,7 +852,7 @@ mod tests {
         assert_eq!(config.filterbank, "legacy");
         assert_eq!(config.bpo, "1_12");
         assert_eq!(config.order, 6);
-        assert_eq!(config.freq_range, "norm");
+        assert_eq!(config.freq_range, "lf");
     }
 
     #[test]

www/core/audio.js

@@ -927,7 +927,7 @@ export function buildRtaRuntimeConfig(CONFIG = {}) {
     lrFractionalDelayEnabled: !!CONFIG.LR_FRACTIONAL_DELAY_ENABLED,
     lrFractionalDelaySamples: Number.isFinite(CONFIG.LR_FRACTIONAL_DELAY_SAMPLES) ? CONFIG.LR_FRACTIONAL_DELAY_SAMPLES : 0,
     bpo: runtimeBpoMode,
-    freqRange: rtwProfile ? 'norm' : (CONFIG.RTA_FREQ_RANGE || 'norm'),
+    freqRange: CONFIG.RTA_FREQ_RANGE === 'lf' ? 'lf' : 'norm',
     weighting: CONFIG.RTA_WEIGHTING || 'z',
     order: rtwProfile ? 6 : (CONFIG.RTA_IIR_ORDER || 6),
     tauFast: CONFIG.RTA_IIR_TAU_FAST || 0.125,

www/core/config.js

@@ -821,7 +821,6 @@ function loadConfig(opts = {}) {
     if (CONFIG.RTA_BAR_LAYOUT === 'rtw') {
       CONFIG.RTA_ENGINE = 'iir';
       CONFIG.RTA_IIR_ORDER = 6;
-      CONFIG.RTA_FREQ_RANGE = 'norm';
       const hold = Number(CONFIG.RTA_PEAK_HOLD_SEC);
       CONFIG.RTA_PEAK_HOLD_SEC = hold >= 3.25 ? 4.0 : 2.5;
     }
@@ -1168,7 +1167,6 @@ function applyPhoenixGlobalConfig(payload = {}) {
   if (CONFIG.RTA_BAR_LAYOUT === 'rtw') {
     CONFIG.RTA_ENGINE = 'iir';
     CONFIG.RTA_IIR_ORDER = 6;
-    CONFIG.RTA_FREQ_RANGE = 'norm';
   }
   const spectroGamma = Number(payload.spectroGamma);
   if (Number.isFinite(spectroGamma)) CONFIG.SPECTRO_GAMMA = Math.max(0.3, Math.min(1.2, spectroGamma));

www/core/rtw_centers.js

@@ -1,10 +1,11 @@
 export const RTW_CENTER_MAP = {
   '1_3': [
-    20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160,
+    5, 6.3, 8, 10, 12.5, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160,
     200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600,
     2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000, 12500, 16000, 20000,
   ],
   '1_6': [
+    5, 5.6, 6.3, 7.08, 8, 9, 10, 11.2, 12.5, 14.1, 16, 18,
     20, 22.4, 25, 28, 31.5, 35.5, 40, 45, 50, 56,
     63, 70.8, 80, 90, 100, 112, 125, 141, 160, 180,
     200, 224, 250, 282, 315, 355, 400, 450, 500, 560,
@@ -13,6 +14,8 @@ export const RTW_CENTER_MAP = {
     6300, 7080, 8000, 9000, 10000, 11200, 12500, 14100, 16000, 18000, 20000,
   ],
   '1_12': [
+    5, 5.3, 5.6, 5.95, 6.3, 6.7, 7.1, 7.5, 8, 8.5, 9, 9.5,
+    10, 10.6, 11.2, 11.8, 12.5, 13.2, 14, 15, 16, 17, 18, 19,
     20, 21.2, 22.4, 23.8, 25, 26.5, 28, 29.8, 31.5, 33.4,
     35.5, 37.6, 40, 42.4, 45, 47.5, 50, 53, 56, 59.5,
     63, 67, 71, 75, 80, 85, 90, 95, 100, 106,

www/ui/options.js

@@ -1002,7 +1002,7 @@ function wireHandlers(env) {
     return val;
   });
   h('opt_rtaFreq', v => {
-    CONFIG.RTA_FREQ_RANGE = CONFIG.RTA_BAR_LAYOUT === 'rtw' ? 'norm' : ((v === 'lf') ? 'lf' : 'norm');
+    CONFIG.RTA_FREQ_RANGE = (v === 'lf') ? 'lf' : 'norm';
     return CONFIG.RTA_FREQ_RANGE;
   });
   h('opt_rtaDisplayGainFft', v => { CONFIG.RTA_DISPLAY_GAIN_FFT_DB = clamp(+v, -25, 25); }, 'val_rtaDisplayGainFft', v=>`${v} dB`);
@@ -1013,11 +1013,9 @@ function wireHandlers(env) {
     if (val === 'rtw') {
       CONFIG.RTA_ENGINE = 'iir';
       CONFIG.RTA_IIR_ORDER = 6;
-      CONFIG.RTA_FREQ_RANGE = 'norm';
       const forced = {
         opt_rtaEngine: 'iir',
         opt_rtaOrder: '6',
-        opt_rtaFreq: 'norm',
       };
       for (const [id, value] of Object.entries(forced)) {
         const control = document.getElementById(id);

www/views/realtime.js

@@ -11,7 +11,7 @@ const METER_PAD_BOTTOM = 5;
 const METER_SLOT_SHRINK = 24; // reduziert nutzbare Höhe leicht, damit Slot niedriger wirkt
 const METER_EXTRA_BOTTOM_PAD = 5;
 const FLOOR_DB = -120;
-const RTA_X_TICKS = [20, 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000, 16000];
+const RTA_X_TICKS = [5, 10, 20, 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000, 16000];
 const DEFAULT_RTA_BAR_BASE_COLOR = MID_COLOR;
 const RTA_PEAK_COLOR = WARN_COLOR;
 const EMBEDDED_RTA_HIDE_20HZ_WIDTH = 420;