diff --git a/src/modules/ExternalNotificationModule.cpp b/src/modules/ExternalNotificationModule.cpp
index a6757e04bcb..0bebb64aadb 100644
--- a/src/modules/ExternalNotificationModule.cpp
+++ b/src/modules/ExternalNotificationModule.cpp
@@ -57,7 +57,10 @@ bool ascending = true;
 
 #define ASCII_BELL 0x07
 
+#if !MESHTASTIC_EXCLUDE_RTTTL
 meshtastic_RTTTLConfig rtttlConfig;
+static const char *rtttlConfigFile = "/prefs/ringtone.proto";
+#endif
 
 ExternalNotificationModule *externalNotificationModule;
 
@@ -65,8 +68,6 @@ bool externalCurrentState[3] = {};
 
 uint32_t externalTurnedOn[3] = {};
 
-static const char *rtttlConfigFile = "/prefs/ringtone.proto";
-
 int32_t ExternalNotificationModule::runOnce()
 {
     if (!moduleConfig.external_notification.enabled) {
@@ -135,7 +136,7 @@ int32_t ExternalNotificationModule::runOnce()
         }
 
         // Play RTTTL over i2s audio interface if enabled as buzzer
-#ifdef HAS_I2S
+#if defined(HAS_I2S) && !MESHTASTIC_EXCLUDE_RTTTL
         if (moduleConfig.external_notification.use_i2s_as_buzzer) {
             if (audioThread->isPlaying()) {
                 // Continue playing
@@ -146,6 +147,7 @@ int32_t ExternalNotificationModule::runOnce()
             delay = EXT_NOTIFICATION_FAST_THREAD_MS;
         }
 #endif
+#if !MESHTASTIC_EXCLUDE_RTTTL
         // now let the PWM buzzer play
         if (moduleConfig.external_notification.use_pwm && config.device.buzzer_gpio && canBuzz() && buzzerShouldAlert) {
             if (rtttl::isPlaying()) {
@@ -157,6 +159,7 @@ int32_t ExternalNotificationModule::runOnce()
             // we need fast updates to play the RTTTL
             delay = EXT_NOTIFICATION_FAST_THREAD_MS;
         }
+#endif
 
         return delay;
     }
@@ -320,16 +323,18 @@ ExternalNotificationModule::ExternalNotificationModule()
     // moduleConfig.external_notification.alert_message_buzzer = true;
 
     if (moduleConfig.external_notification.enabled) {
-#if !defined(MESHTASTIC_EXCLUDE_INPUTBROKER)
+#if !MESHTASTIC_EXCLUDE_INPUTBROKER
         if (inputBroker) // put our callback in the inputObserver list
             inputObserver.observe(inputBroker);
 #endif
+#if !MESHTASTIC_EXCLUDE_RTTTL
         if (nodeDB->loadProto(rtttlConfigFile, meshtastic_RTTTLConfig_size, sizeof(meshtastic_RTTTLConfig),
                               &meshtastic_RTTTLConfig_msg, &rtttlConfig) != LoadFileResult::LOAD_SUCCESS) {
             memset(rtttlConfig.ringtone, 0, sizeof(rtttlConfig.ringtone));
             // The default ringtone is always loaded from userPrefs.jsonc
             strncpy(rtttlConfig.ringtone, USERPREFS_RINGTONE_RTTTL, sizeof(rtttlConfig.ringtone));
         }
+#endif
 
         LOG_INFO("Init External Notification Module");
 
@@ -459,11 +464,13 @@ ProcessMessage ExternalNotificationModule::handleReceived(const meshtastic_MeshP
                 } else {
                     // Buzz if buzzer mode is not in DIRECT_MSG_ONLY or is DM to us
                     if (moduleConfig.external_notification.use_i2s_as_buzzer) {
-#ifdef HAS_I2S
+#if defined(HAS_I2S) && !MESHTASTIC_EXCLUDE_RTTTL
                         audioThread->beginRttl(rtttlConfig.ringtone, strlen_P(rtttlConfig.ringtone));
 #endif
                     } else if (moduleConfig.external_notification.use_pwm) {
+#if !MESHTASTIC_EXCLUDE_RTTTL
                         rtttl::begin(config.device.buzzer_gpio, rtttlConfig.ringtone);
+#endif
                     } else {
                         setExternalState(2, true);
                     }
@@ -495,6 +502,7 @@ AdminMessageHandleResult ExternalNotificationModule::handleAdminMessageForModule
     AdminMessageHandleResult result;
 
     switch (request->which_payload_variant) {
+#if !MESHTASTIC_EXCLUDE_RTTTL
     case meshtastic_AdminMessage_get_ringtone_request_tag:
         LOG_INFO("Client getting ringtone");
         this->handleGetRingtone(mp, response);
@@ -506,6 +514,7 @@ AdminMessageHandleResult ExternalNotificationModule::handleAdminMessageForModule
         this->handleSetRingtone(request->set_canned_message_module_messages);
         result = AdminMessageHandleResult::HANDLED;
         break;
+#endif
 
     default:
         result = AdminMessageHandleResult::NOT_HANDLED;
@@ -514,6 +523,7 @@ AdminMessageHandleResult ExternalNotificationModule::handleAdminMessageForModule
     return result;
 }
 
+#if !MESHTASTIC_EXCLUDE_RTTTL
 void ExternalNotificationModule::handleGetRingtone(const meshtastic_MeshPacket &req, meshtastic_AdminMessage *response)
 {
     LOG_INFO("*** handleGetRingtone");
@@ -537,7 +547,9 @@ void ExternalNotificationModule::handleSetRingtone(const char *from_msg)
         nodeDB->saveProto(rtttlConfigFile, meshtastic_RTTTLConfig_size, &meshtastic_RTTTLConfig_msg, &rtttlConfig);
     }
 }
+#endif
 
+#if !MESHTASTIC_EXCLUDE_INPUTBROKER
 int ExternalNotificationModule::handleInputEvent(const InputEvent *event)
 {
     if (nagCycleCutoff != UINT32_MAX) {
@@ -546,3 +558,4 @@ int ExternalNotificationModule::handleInputEvent(const InputEvent *event)
     }
     return 0;
 }
+#endif
diff --git a/src/modules/ExternalNotificationModule.h b/src/modules/ExternalNotificationModule.h
index 03eac036bb6..ea4759ad59f 100644
--- a/src/modules/ExternalNotificationModule.h
+++ b/src/modules/ExternalNotificationModule.h
@@ -23,10 +23,10 @@ extern AmbientLightingThread *ambientLightingThread;
 #endif
 #endif
 
-#if !defined(ARCH_PORTDUINO) && !defined(ARCH_STM32WL) && !defined(CONFIG_IDF_TARGET_ESP32C6)
+#if !MESHTASTIC_EXCLUDE_RTTTL
 #include <NonBlockingRtttl.h>
 #else
-// Noop class for portduino.
+// Noop class for portduino/STM32WL/ESP32C6 - none can drive PWM RTTTL playback.
 class rtttl
 {
   public:
@@ -47,8 +47,10 @@ class rtttl
  */
 class ExternalNotificationModule : public SinglePortModule, private concurrency::OSThread
 {
+#if !MESHTASTIC_EXCLUDE_INPUTBROKER
     CallbackObserver<ExternalNotificationModule, const InputEvent *> inputObserver =
         CallbackObserver<ExternalNotificationModule, const InputEvent *>(this, &ExternalNotificationModule::handleInputEvent);
+#endif
     uint32_t output = 0;
 
 #ifdef NEOPIXEL_STATUS_NOTIFICATION_PIN
@@ -58,7 +60,9 @@ class ExternalNotificationModule : public SinglePortModule, private concurrency:
   public:
     ExternalNotificationModule();
 
+#if !MESHTASTIC_EXCLUDE_INPUTBROKER
     int handleInputEvent(const InputEvent *arg);
+#endif
 
     uint32_t nagCycleCutoff = 1;
 
@@ -73,8 +77,10 @@ class ExternalNotificationModule : public SinglePortModule, private concurrency:
 
     void stopNow();
 
+#if !MESHTASTIC_EXCLUDE_RTTTL
     void handleGetRingtone(const meshtastic_MeshPacket &req, meshtastic_AdminMessage *response);
     void handleSetRingtone(const char *from_msg);
+#endif
 
   protected:
     /** Called to handle a particular incoming message
diff --git a/variants/esp32c6/esp32c6.ini b/variants/esp32c6/esp32c6.ini
index ae91e6e81fd..4c75fa90b9b 100644
--- a/variants/esp32c6/esp32c6.ini
+++ b/variants/esp32c6/esp32c6.ini
@@ -9,6 +9,8 @@ build_flags =
   ; Exclude Paxcounter, it uses 'esp_vhci_host_send_packet' whch is not available on ESP32-C6
   ; https://github.com/espressif/arduino-esp32/issues/11716
   -DMESHTASTIC_EXCLUDE_PAXCOUNTER
+  ; No PWM/RTTTL ringtone playback support on this platform.
+  -DMESHTASTIC_EXCLUDE_RTTTL
 
 build_src_filter = 
  ${esp32_common.build_src_filter}
diff --git a/variants/native/portduino.ini b/variants/native/portduino.ini
index 98cbaf6c3d7..20e0e0d7c61 100644
--- a/variants/native/portduino.ini
+++ b/variants/native/portduino.ini
@@ -49,6 +49,7 @@ build_flags_common =
   -fPIC
   -Isrc/platform/portduino
   -DRADIOLIB_EEPROM_UNSUPPORTED
+  -DMESHTASTIC_EXCLUDE_RTTTL ; No PWM/RTTTL ringtone playback support on this platform.
   -lpthread
   -lyaml-cpp
   -ljsoncpp
diff --git a/variants/stm32/stm32.ini b/variants/stm32/stm32.ini
index 4300e3b7aac..7d1d3e00404 100644
--- a/variants/stm32/stm32.ini
+++ b/variants/stm32/stm32.ini
@@ -16,20 +16,21 @@ build_flags =
   ${arduino_base.build_flags}
   -flto
   -Isrc/platform/stm32wl -g
-  -DMESHTASTIC_EXCLUDE_AUDIO=1
   -DMESHTASTIC_EXCLUDE_ATAK=1 ; ATAK is quite big, disable it for big flash savings.
+  -DMESHTASTIC_EXCLUDE_AUDIO=1
+  -DMESHTASTIC_EXCLUDE_BLUETOOTH=1
   -DMESHTASTIC_EXCLUDE_INPUTBROKER=1
-  -DMESHTASTIC_EXCLUDE_POWERMON=1
-  -DMESHTASTIC_EXCLUDE_SCREEN=1
   -DMESHTASTIC_EXCLUDE_MQTT=1
-  -DMESHTASTIC_EXCLUDE_BLUETOOTH=1
-  -DMESHTASTIC_EXCLUDE_WIFI=1
-  -DMESHTASTIC_EXCLUDE_TZ=1 ; Exclude TZ to save some flash space.
-  -DMESHTASTIC_EXCLUDE_XEDDSA=1 ; The Ed25519 signing code does not fit in the 256KB flash. Packets are sent unsigned, like pre-XEdDSA firmware.
   -DMESHTASTIC_EXCLUDE_PKT_HISTORY_HASH=1
+  -DMESHTASTIC_EXCLUDE_POWERMON=1
+  -DMESHTASTIC_EXCLUDE_POWER_TELEMETRY=1
   -DMESHTASTIC_EXCLUDE_RANGETEST=1
+  -DMESHTASTIC_EXCLUDE_RTTTL=1 ; No PWM/RTTTL ringtone playback support on this platform.
+  -DMESHTASTIC_EXCLUDE_SCREEN=1
+  -DMESHTASTIC_EXCLUDE_TZ=1 ; Exclude TZ to save some flash space.
   -DMESHTASTIC_EXCLUDE_WAYPOINT=1
-  -DMESHTASTIC_EXCLUDE_POWER_TELEMETRY=1
+  -DMESHTASTIC_EXCLUDE_WIFI=1
+  -DMESHTASTIC_EXCLUDE_XEDDSA=1 ; The Ed25519 signing code does not fit in the 256KB flash. Packets are sent unsigned, like pre-XEdDSA firmware.
   -DSERIAL_RX_BUFFER_SIZE=256 ; For GPS - the default of 64 is too small.
   -DHAS_SCREEN=0 ; Always disable screen for STM32, it is not supported.
   ;-DPIO_FRAMEWORK_ARDUINO_NANOLIB_FLOAT_PRINTF ; Enable this if enabling debugg logging. It is REQUIRED for at least traceroute debug prints - without it the length returned by printf ends up uninitialized.