diff --git a/internal_filesystem/lib/mpos/audio/stream_wav.py b/internal_filesystem/lib/mpos/audio/stream_wav.py
index c2a672c4..e84f254e 100644
--- a/internal_filesystem/lib/mpos/audio/stream_wav.py
+++ b/internal_filesystem/lib/mpos/audio/stream_wav.py
@@ -329,7 +329,6 @@ class WAVStream:
 
                 # Decide playback rate (force >=22050 Hz) - but why?! the DAC should support down to 8kHz!
                 target_rate = 22050 # slower is faster (less data)
-                target_rate = 22050 * 2 # CJC only supports 30kHz and up?
                 if original_rate >= target_rate:
                     playback_rate = original_rate
                     upsample_factor = 1
@@ -365,17 +364,29 @@ class WAVStream:
                             print(f"MCLK PWM init failed: {e}")
                             # fallback or error handling
 
-                    self._i2s = machine.I2S(
-                        0,
-                        sck=machine.Pin(self.i2s_pins['sck'], machine.Pin.OUT),
-                        ws=machine.Pin(self.i2s_pins['ws'], machine.Pin.OUT),
-                        sd=machine.Pin(self.i2s_pins['sd'], machine.Pin.OUT),
-                        mode=machine.I2S.TX,
-                        bits=16,
-                        format=i2s_format,
-                        rate=playback_rate,
-                        ibuf=32000
-                    )
+                    if self.i2s_pins.get("sck"):
+                        self._i2s = machine.I2S(
+                            0,
+                            sck=machine.Pin(self.i2s_pins['sck'], machine.Pin.OUT),
+                            ws=machine.Pin(self.i2s_pins['ws'], machine.Pin.OUT),
+                            sd=machine.Pin(self.i2s_pins['sd'], machine.Pin.OUT),
+                            mode=machine.I2S.TX,
+                            bits=16,
+                            format=i2s_format,
+                            rate=playback_rate,
+                            ibuf=32000
+                        )
+                    else:
+                        self._i2s = machine.I2S(
+                            0,
+                            ws=machine.Pin(self.i2s_pins['ws'], machine.Pin.OUT),
+                            sd=machine.Pin(self.i2s_pins['sd'], machine.Pin.OUT),
+                            mode=machine.I2S.TX,
+                            bits=16,
+                            format=i2s_format,
+                            rate=playback_rate,
+                            ibuf=32000
+                        )
                 except Exception as e:
                     print(f"WAVStream: I2S init failed: {e}")
                     return
diff --git a/internal_filesystem/lib/mpos/board/fri3d_2026.py b/internal_filesystem/lib/mpos/board/fri3d_2026.py
index 12e688a5..15313b26 100644
--- a/internal_filesystem/lib/mpos/board/fri3d_2026.py
+++ b/internal_filesystem/lib/mpos/board/fri3d_2026.py
@@ -198,7 +198,6 @@ mpos.sdcard.init(spi_bus=spi_bus, cs_pin=14)
 
 # === AUDIO HARDWARE ===
 from machine import PWM, Pin
-from mpos import AudioManager
 
 # Initialize buzzer: now sits on PC14/CC1 of the CH32X035GxUx so needs custom code
 #buzzer = PWM(Pin(46), freq=550, duty=0)
@@ -208,26 +207,18 @@ from mpos import AudioManager
 # The DAC uses BCK (bit clock) on GPIO 2, while the microphone uses SCLK on GPIO 17
 # See schematics: DAC has BCK=2, WS=47, SD=16; Microphone has SCLK=17, WS=47, DIN=15
 
-# This worked briefly, way too loud and with distortion:
-i2s_pins = {
-    'sck': 2,       # SCLK or BCLK (optional)
-    'ws': 47,       # Word Select / LRCLK shared between DAC and mic (mandatory)
-    'sd': 16,       # Serial Data OUT (speaker/DAC)
-    'sck_in': 17,   # SCLK - Serial Clock for microphone input (optional for audio out)
-}
-'''
-# This is how it should be (untested)
 i2s_pins = {
     # Output (DAC/speaker) pins
     'mck': 2,       # MCLK (mandatory)
-    #'sck': 17,      # SCLK aka BCLK (optional)
+    'sck': 17,      # SCLK aka BCLK (optional)
     'ws': 47,       # Word Select / LRCLK shared between DAC and mic (mandatory)
     'sd': 16,       # Serial Data OUT (speaker/DAC)
 }
-'''
+
 # Initialize AudioManager with I2S (buzzer TODO)
 # ADC microphone is on GPIO 1
-#AudioManager(i2s_pins=i2s_pins, adc_mic_pin=1)
+from mpos import AudioManager
+AudioManager(i2s_pins=i2s_pins, adc_mic_pin=1)
 
 # === SENSOR HARDWARE ===
 from mpos import SensorManager
diff --git a/internal_filesystem/lib/mpos/main.py b/internal_filesystem/lib/mpos/main.py
index 90273f9e..d8eaaf36 100644
--- a/internal_filesystem/lib/mpos/main.py
+++ b/internal_filesystem/lib/mpos/main.py
@@ -132,7 +132,7 @@ def detect_board():
 
         if i2c0 := fail_save_i2c(sda=10, scl=11):
             if single_address_i2c_scan(i2c0, 0x20): # IMU
-                return "lilygo_t_watch_s3_plus"
+                return "lilygo_t_watch_s3_plus" # example MAC address: D0:CF:13:33:36:306
         
         print("Unknown board: couldn't detect known I2C devices or unique_id prefix")