diff --git a/.gitignore b/.gitignore
index e9927143..f5e46736 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,3 +30,6 @@ __pycache__/
 
 # these get created:
 c_mpos/c_mpos
+
+# build files
+*.bin
diff --git a/internal_filesystem/apps/com.micropythonos.musicplayer/assets/music_player.py b/internal_filesystem/apps/com.micropythonos.musicplayer/assets/music_player.py
index 402b3b2b..689d72d4 100644
--- a/internal_filesystem/apps/com.micropythonos.musicplayer/assets/music_player.py
+++ b/internal_filesystem/apps/com.micropythonos.musicplayer/assets/music_player.py
@@ -62,19 +62,21 @@ class FullscreenPlayer(Activity):
     def onCreate(self):
         self._filename = self.getIntent().extras.get("filename")
         qr_screen = lv.obj()
-        self._slider_label=lv.label(qr_screen)
+        self._slider_label = lv.label(qr_screen)
         self._slider_label.set_text(f"Volume: {AudioManager.get_volume()}%")
-        self._slider_label.align(lv.ALIGN.TOP_MID,0,lv.pct(4))
-        self._slider=lv.slider(qr_screen)
-        self._slider.set_range(0,16)
-        self._slider.set_value(int(AudioManager.get_volume()/6.25), False)
+        self._slider_label.align(lv.ALIGN.TOP_MID, 0, lv.pct(4))
+        self._slider = lv.slider(qr_screen)
+        self._slider.set_range(0, 100)
+        self._slider.set_value(int(AudioManager.get_volume()), False)
         self._slider.set_width(lv.pct(90))
-        self._slider.align_to(self._slider_label,lv.ALIGN.OUT_BOTTOM_MID,0,10)
+        self._slider.align_to(self._slider_label, lv.ALIGN.OUT_BOTTOM_MID, 0, 10)
+
         def volume_slider_changed(e):
-            volume_int = self._slider.get_value()*6.25
+            volume_int = int(self._slider.get_value())
             self._slider_label.set_text(f"Volume: {volume_int}%")
             AudioManager.set_volume(volume_int)
-        self._slider.add_event_cb(volume_slider_changed,lv.EVENT.VALUE_CHANGED,None)
+
+        self._slider.add_event_cb(volume_slider_changed, lv.EVENT.VALUE_CHANGED, None)
         self._filename_label = lv.label(qr_screen)
         self._filename_label.align(lv.ALIGN.CENTER,0,0)
         self._filename_label.set_text(self._filename)
diff --git a/internal_filesystem/lib/mpos/audio/audiomanager.py b/internal_filesystem/lib/mpos/audio/audiomanager.py
index 7a8f631b..fac23dd6 100644
--- a/internal_filesystem/lib/mpos/audio/audiomanager.py
+++ b/internal_filesystem/lib/mpos/audio/audiomanager.py
@@ -187,7 +187,23 @@ class AudioManager:
 
     @classmethod
     def set_volume(cls, volume):
-        cls.get()._volume = max(0, min(100, volume))
+        manager = cls.get()
+        try:
+            volume_int = int(round(volume))
+        except (TypeError, ValueError):
+            return manager._volume
+        volume_int = max(0, min(100, volume_int))
+        manager._volume = volume_int
+
+        for session in list(manager._active_sessions):
+            stream = getattr(session, "_stream", None)
+            if stream and hasattr(stream, "set_volume"):
+                try:
+                    stream.set_volume(volume_int)
+                except Exception:
+                    pass
+
+        return volume_int
 
     @classmethod
     def get_volume(cls):
diff --git a/internal_filesystem/lib/mpos/board/linux.py b/internal_filesystem/lib/mpos/board/linux.py
index 43aab645..1ef9556f 100644
--- a/internal_filesystem/lib/mpos/board/linux.py
+++ b/internal_filesystem/lib/mpos/board/linux.py
@@ -108,7 +108,6 @@ from mpos import AudioManager
 # Desktop builds have no real audio hardware, but we simulate microphone
 # recording with a 440Hz sine wave for testing WAV file generation
 # The i2s_pins dict with 'sd_in' enables microphone simulation
-AudioManager()
 
 output_i2s_pins = {
     'sck': 0,       # Simulated - not used on desktop
diff --git a/internal_filesystem/lib/mpos/board/m5stack_fire.py b/internal_filesystem/lib/mpos/board/m5stack_fire.py
index 1292b6e3..6c95bf09 100644
--- a/internal_filesystem/lib/mpos/board/m5stack_fire.py
+++ b/internal_filesystem/lib/mpos/board/m5stack_fire.py
@@ -48,7 +48,6 @@ MPU6886_I2C_FREQ = const(400000)
 
 print("m5stack_fire.py init buzzer")
 buzzer = PWM(Pin(BUZZER_PIN, Pin.OUT, value=1), duty=5)
-AudioManager()
 AudioManager.add(AudioManager.Output("buzzer", "buzzer", buzzer_pin=BUZZER_PIN))
 AudioManager.set_volume(40)