diff --git a/sw_usb_audio/app_usb_aud_fosi_c1_lp/src/extensions/dsp_wrapper.c b/sw_usb_audio/app_usb_aud_fosi_c1_lp/src/extensions/dsp_wrapper.c
index f07a547..9cb3f78 100644
--- a/sw_usb_audio/app_usb_aud_fosi_c1_lp/src/extensions/dsp_wrapper.c
+++ b/sw_usb_audio/app_usb_aud_fosi_c1_lp/src/extensions/dsp_wrapper.c
@@ -69,74 +69,8 @@ void unmute_dac(void);
 void unmute_spdif_led(void);
 void UserBufferManagement(unsigned sampsFromUsbToAudio[], unsigned sampsFromAudioToUsb[])
 {
-    static unsigned mute_count = 0;
-    static unsigned unmute_count = 0;
-    static unsigned mute_threshold = 200000;    // 静音阈值
-    static unsigned unmute_threshold = 1000;    // 取消静音阈值，可根据实际调整
-    static unsigned unmute_delay = 1000;
-    static unsigned old_samfreq = 0;
-    unsigned samfreq;
-    GET_SHARED_GLOBAL(samfreq, g_samfreq);
-    if (samfreq <= 192000)
-    {
-    if (samfreq != old_samfreq)
-    {
-        old_samfreq = samfreq;
-        mute_count = 0;
-        unmute_count = 0;
-        mute_threshold = samfreq / 2;
-        unmute_threshold = samfreq / 50;
-        unmute_delay = samfreq / 200;
-        amp_muted  = 1;
-        debug_printf("samFreq %d and mute\n", samfreq);
-        #if !OPT && !COAX
-        mute_dac();
-        #else
-        mute_dac();
-        #endif
-    }
 
-    if (is_silence(sampsFromUsbToAudio, 2))
-    {
-        mute_count++;
-        if ((mute_count > unmute_delay) && (unmute_count != 0))
-        {
-            unmute_count = 0;
-            debug_printf("mute_count %d\n", mute_count);
-        }
-        if (mute_count >= mute_threshold && !amp_muted) {
-            //mute_amp();
-            amp_muted = 1;
-            #if !OPT && !COAX
-            // sampsFromUsbToAudio[0] = 0;
-            // sampsFromUsbToAudio[1] = 0;
-            //    mute_dac();
-            #else
-                //mute_dac();
-            #endif
-            //debug_printf("AMP Muted\n");
-        }
-    }
-    else
-    {
-        unmute_count++;
-        if (unmute_count > unmute_delay)
-        {
-            mute_count = 0;
-            debug_printf("unmute_count %d\n", unmute_count);
-        }
-        if (unmute_count >= unmute_threshold) {
-            //unmute_amp();
-            amp_muted = 0;
-            #if !OPT && !COAX
-            unmute_dac();
-            #else
-            unmute_dac();
-            unmute_spdif_led();
-            #endif
-            //debug_printf("AMP Unmuted\n");
-        }
-    }
+    
 #if EQ_EN
 
     unsigned eq_enable;
@@ -154,11 +88,5 @@ void UserBufferManagement(unsigned sampsFromUsbToAudio[], unsigned sampsFromAudi
         sampsFromUsbToAudio[1] = read_from_ring_buffer(3);
     }
 #endif
-    }
-    else
-    {
-            mute_count = 0;
-            unmute_count = 0;
-    }
 }
 #endif
diff --git a/sw_usb_audio/app_usb_aud_fosi_c1_lp/src/extensions/extra_i2s.xc b/sw_usb_audio/app_usb_aud_fosi_c1_lp/src/extensions/extra_i2s.xc
index ea318fb..eadaca6 100644
--- a/sw_usb_audio/app_usb_aud_fosi_c1_lp/src/extensions/extra_i2s.xc
+++ b/sw_usb_audio/app_usb_aud_fosi_c1_lp/src/extensions/extra_i2s.xc
@@ -106,80 +106,14 @@ inline unsigned is_silence(const unsigned samps[], int len)
 
 void UserBufferManagement(unsigned sampsFromUsbToAudio[], unsigned sampsFromAudioToUsb[])
 {
-#if 0
     unsigned dnr_enable = 0;
     unsigned adc_loop = 0;
-    unsigned l_3d_fps = 0;
-    static int amp_muted = 0;
     unsafe
     {
         GET_SHARED_GLOBAL(dnr_enable, g_dnr_enable);
-        GET_SHARED_GLOBAL(l_3d_fps, g_3d_fps);
-   //     GET_SHARED_GLOBAL(fps_enable, g_fps_enable);
-   //     GET_SHARED_GLOBAL(three_d_enable, g_3d_enable);
         GET_SHARED_GLOBAL(adc_loop, g_adc_loop);
 
 
-        if (l_3d_fps == 2)
-        {
-            static unsigned mute_count = 0;
-            static unsigned unmute_count = 0;
-            static unsigned mute_threshold = 48000;    // 静音阈值
-            static unsigned unmute_threshold = 4800;    // 取消静音阈值，可根据实际调整
-            static unsigned unmute_delay = 1000;
-
-            if (is_silence(sampsFromUsbToAudio, 2))
-            {
-                mute_count++;
-                if (mute_count > unmute_delay)
-                {
-                    unmute_count = 0;
-                }
-                if (mute_count >= mute_threshold) {
-                    amp_muted = 1;
-#if 0
-                    sampsFromUsbToAudio[0] = 0;
-                    sampsFromUsbToAudio[1] = 0;
-                    sampsFromUsbToAudio[2] = 0;
-                    sampsFromUsbToAudio[3] = 0;
-                    sampsFromUsbToAudio[4] = 0;
-                    sampsFromUsbToAudio[5] = 0;
-                    sampsFromUsbToAudio[6] = 0;
-                    sampsFromUsbToAudio[7] = 0;
-#endif
-                   // debug_printf("AMP Muted\n");
-                }
-            }
-            else
-            {
-                unmute_count++;
-                if (unmute_count > unmute_delay)
-                {
-                    mute_count = 0;
-                }
-                if (unmute_count >= unmute_threshold && amp_muted) {
-                    amp_muted = 0;
-                    unmute_dac();
-                }
-            }
-
-            buffer_exchange((chanend) uc_br_data, sampsFromUsbToAudio, sampsFromAudioToUsb, NUM_USB_CHAN_OUT);
-        }
-        else
-        {
-            
-            if (sampsFromUsbToAudio[2] != 0)
-            {
-                sampsFromUsbToAudio[0] += sampsFromUsbToAudio[2];
-                sampsFromUsbToAudio[1] += sampsFromUsbToAudio[2];
-            }
-
-            if (l_3d_fps == 1)
-            {
-               buffer_exchange((chanend) uc_br_data, sampsFromUsbToAudio, sampsFromAudioToUsb, 2);
-            }
- 
-        }
 
         if (dnr_enable)
         {
@@ -192,50 +126,11 @@ void UserBufferManagement(unsigned sampsFromUsbToAudio[], unsigned sampsFromAudi
         
         if (adc_loop)
         {
-            amp_muted = 0;
-            unmute_dac();
             sampsFromUsbToAudio[0] = (sampsFromAudioToUsb[1]) + (sampsFromUsbToAudio[0]);
             sampsFromUsbToAudio[1] = (sampsFromAudioToUsb[1]) + (sampsFromUsbToAudio[1]);
         }
-        else if (l_3d_fps != 2)
-        {
+       }
 
-        static unsigned mute_count = 0;
-        static unsigned unmute_count = 0;
-        static unsigned mute_threshold = 2800;    // 静音阈值
-        static unsigned unmute_threshold = 4800;    // 取消静音阈值，可根据实际调整
-        static unsigned unmute_delay = 1000;
-
-        if (is_silence(sampsFromUsbToAudio, 2))
-        {
-            mute_count++;
-            if (mute_count > unmute_delay)
-            {
-                unmute_count = 0;
-            }
-            if (mute_count >= mute_threshold) {
-                amp_muted = 1;
-                //sampsFromUsbToAudio[0] = 0;
-                //sampsFromUsbToAudio[1] = 0;
-               // debug_printf("AMP Muted\n");
-            }
-        }
-        else
-        {
-            unmute_count++;
-            if (unmute_count > unmute_delay)
-            {
-                mute_count = 0;
-            }
-            if (unmute_count >= unmute_threshold && amp_muted) {
-                amp_muted = 0;
-                unmute_dac();
-            }
-        }
-        }
-
-    }
-#endif
 }
 #endif