diff --git a/cereal/custom.capnp b/cereal/custom.capnp
index 833845d36d..5243380d31 100644
--- a/cereal/custom.capnp
+++ b/cereal/custom.capnp
@@ -69,6 +69,45 @@ struct LeadData {
 struct SelfdriveStateSP @0x81c2f05a394cf4af {
   mads @0 :ModularAssistiveDrivingSystem;
   intelligentCruiseButtonManagement @1 :IntelligentCruiseButtonManagement;
+
+  enum AudibleAlert {
+    none @0;
+
+    engage @1;
+    disengage @2;
+    refuse @3;
+
+    warningSoft @4;
+    warningImmediate @5;
+
+    prompt @6;
+    promptRepeat @7;
+    promptDistracted @8;
+
+    # unused, these are reserved for upstream events so we don't collide
+    reserved9 @9;
+    reserved10 @10;
+    reserved11 @11;
+    reserved12 @12;
+    reserved13 @13;
+    reserved14 @14;
+    reserved15 @15;
+    reserved16 @16;
+    reserved17 @17;
+    reserved18 @18;
+    reserved19 @19;
+    reserved20 @20;
+    reserved21 @21;
+    reserved22 @22;
+    reserved23 @23;
+    reserved24 @24;
+    reserved25 @25;
+    reserved26 @26;
+    reserved27 @27;
+    reserved28 @28;
+    reserved29 @29;
+    reserved30 @30;
+  }
 }
 
 struct ModelManagerSP @0xaedffd8f31e7b55d {
diff --git a/selfdrive/ui/soundd.py b/selfdrive/ui/soundd.py
index a94456efe0..485c406266 100644
--- a/selfdrive/ui/soundd.py
+++ b/selfdrive/ui/soundd.py
@@ -4,7 +4,7 @@ import time
 import wave
 
 
-from cereal import car, messaging
+from cereal import car, messaging, custom
 from openpilot.common.basedir import BASEDIR
 from openpilot.common.filter_simple import FirstOrderFilter
 from openpilot.common.realtime import Ratekeeper
@@ -26,8 +26,13 @@ AMBIENT_DB = 30 # DB where MIN_VOLUME is applied
 DB_SCALE = 30 # AMBIENT_DB + DB_SCALE is where MAX_VOLUME is applied
 
 AudibleAlert = car.CarControl.HUDControl.AudibleAlert
+AudibleAlertSP = custom.SelfdriveStateSP.AudibleAlert
 
 
+sound_list_sp: dict[int, tuple[str, int | None, float]] = {
+  # AudibleAlertSP, file name, play count (none for infinite)
+}
+
 sound_list: dict[int, tuple[str, int | None, float]] = {
   # AudibleAlert, file name, play count (none for infinite)
   AudibleAlert.engage: ("engage.wav", 1, MAX_VOLUME),
@@ -40,6 +45,8 @@ sound_list: dict[int, tuple[str, int | None, float]] = {
 
   AudibleAlert.warningSoft: ("warning_soft.wav", None, MAX_VOLUME),
   AudibleAlert.warningImmediate: ("warning_immediate.wav", None, MAX_VOLUME),
+
+  **sound_list_sp,
 }
 
 def check_selfdrive_timeout_alert(sm):