Add 3.8 changelog and fix RTA octave selection

src/state.rs

@@ -663,6 +663,9 @@ fn apply_global_to_rta(
 ) -> PhoenixRtaConfig {
     config.fft_size = global.fft_size;
     config.bpo = global.rta_bpo_mode.clone();
+    if config.bpo != "1_3" && config.layout == "rtw" {
+        config.layout = "iec".to_string();
+    }
     config.input_offset_db_l = global.input_offset_db_l;
     config.input_offset_db_r = global.input_offset_db_r;
     config.mono_input = global.mono_input;
@@ -744,4 +747,14 @@ mod tests {
         assert_eq!(config.freq_range, "lf");
         assert_eq!(config.integration, "medium");
     }
+
+    #[test]
+    fn non_third_octave_global_selection_leaves_locked_rtw_profile() {
+        let mut global = PhoenixGlobalConfig::default();
+        global.rta_bpo_mode = "1_12".to_string();
+        let config = apply_global_to_rta(PhoenixRtaConfig::default(), &global);
+        assert_eq!(config.layout, "iec");
+        assert_eq!(config.bpo, "1_12");
+        assert_eq!(config.engine, "iir");
+    }
 }