Add 3.8 changelog and fix RTA octave selection

www/core/config.js

@@ -281,6 +281,17 @@ const CONFIG = {
   SOFTWARE_PRESET: 'default',
 };
 const CONFIG_DEFAULTS = JSON.parse(JSON.stringify(CONFIG));
+
+function applyRtaBpoSelection(value) {
+  const mode = ['1_3', '1_6', '1_12'].includes(String(value)) ? String(value) : '1_3';
+  CONFIG.RTA_BPO_MODE = mode;
+  // RTW remains the original 31-band third-octave reference profile. Finer
+  // resolutions are Phoenix extensions and switch visibly to the IEC profile.
+  if (mode !== '1_3' && CONFIG.RTA_BAR_LAYOUT === 'rtw') {
+    CONFIG.RTA_BAR_LAYOUT = 'iec';
+  }
+  return mode;
+}
 const SOFTWARE_PRESET_IDS = Object.freeze(['default', 'claus', 'michael']);
 const LAYOUT_PRESET_IDS = Object.freeze(['1', '2', '3', '4']);
 const LAYOUT_PRESET_KEYS = Object.freeze([
@@ -778,6 +789,9 @@ function loadConfig(opts = {}) {
     if (typeof saved.PPM_DIN_DECAY_DB_PER_S === 'number') CONFIG.PPM_DIN_DECAY_DB_PER_S = saved.PPM_DIN_DECAY_DB_PER_S;
     if (typeof saved.PPM_DIN_HOLD_MS === 'number') CONFIG.PPM_DIN_HOLD_MS = saved.PPM_DIN_HOLD_MS;
     if (CONFIG.RTA_BAR_LAYOUT === 'classic') CONFIG.RTA_BAR_LAYOUT = 'rtw';
+    if (CONFIG.RTA_BAR_LAYOUT === 'rtw' && CONFIG.RTA_BPO_MODE !== '1_3') {
+      CONFIG.RTA_BAR_LAYOUT = 'iec';
+    }
     if (CONFIG.RTA_BAR_LAYOUT === 'rtw') {
       CONFIG.RTA_ENGINE = 'iir';
       CONFIG.RTA_BPO_MODE = '1_3';
@@ -1108,7 +1122,7 @@ function applyPhoenixGlobalConfig(payload = {}) {
   }
   if ('rtaBpoMode' in payload) {
     const mode = String(payload.rtaBpoMode || '').trim();
-    CONFIG.RTA_BPO_MODE = (mode === '1_3' || mode === '1_6' || mode === '1_12') ? mode : '1_6';
+    applyRtaBpoSelection(mode);
   }
   if (CONFIG.RTA_BAR_LAYOUT === 'rtw') {
     CONFIG.RTA_ENGINE = 'iir';
@@ -1278,6 +1292,7 @@ export {
   saveConfig, 
   buildPhoenixGlobalConfigPayload,
   applyPhoenixGlobalConfig,
+  applyRtaBpoSelection,
   applyBroadcastStandard, 
   applySoftwarePreset,
   loadSoftwarePreset,