diff --git a/usermods/audioreactive/audio_reactive.h b/usermods/audioreactive/audio_reactive.h
index 8fa65e30..18c9ad23 100644
--- a/usermods/audioreactive/audio_reactive.h
+++ b/usermods/audioreactive/audio_reactive.h
@@ -1800,6 +1800,10 @@ class AudioReactive : public Usermod {
       #endif
       delay(100);         // Give that poor microphone some time to setup.
 
+      #if !defined(CONFIG_IDF_TARGET_ESP32S2) && !defined(CONFIG_IDF_TARGET_ESP32C3)
+        if ((i2sckPin == I2S_PIN_NO_CHANGE) && ((dmType == 1) || (dmType == 4)) ) dmType = 5;   // dummy user support: SCK == -1 --means--> PDM microphone
+      #endif
+
       useInputFilter = 2; // default: DC blocker
       switch (dmType) {
       #if defined(CONFIG_IDF_TARGET_ESP32S2) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32S3)