diff --git a/examples/device/audio_4_channel_mic/src/tusb_config.h b/examples/device/audio_4_channel_mic/src/tusb_config.h
index f86b63528..cf44918e2 100644
--- a/examples/device/audio_4_channel_mic/src/tusb_config.h
+++ b/examples/device/audio_4_channel_mic/src/tusb_config.h
@@ -126,12 +126,12 @@ extern "C" {
 #define CFG_TUD_AUDIO_ENABLE_TYPE_I_ENCODING          1
 #define CFG_TUD_AUDIO_FUNC_1_CHANNEL_PER_FIFO_TX      2         // One I2S stream contains two channels, each stream is saved within one support FIFO - this value is currently fixed, the driver does not support a changing value
 #define CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO        (CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX / CFG_TUD_AUDIO_FUNC_1_CHANNEL_PER_FIFO_TX)
-#define CFG_TUD_AUDIO_FUNC_1_TX_SUPP_SW_FIFO_SZ       4 * (CFG_TUD_AUDIO_EP_SZ_IN / CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO)
+#define CFG_TUD_AUDIO_FUNC_1_TX_SUPP_SW_FIFO_SZ       4 * (CFG_TUD_AUDIO_EP_SZ_IN / CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO) // Minimum 4*EP size is needed for flow control
 
 #else
 
 #define CFG_TUD_AUDIO_FUNC_1_EP_IN_SZ_MAX             CFG_TUD_AUDIO_EP_SZ_IN
-#define CFG_TUD_AUDIO_FUNC_1_EP_IN_SW_BUF_SZ          4 * CFG_TUD_AUDIO_EP_SZ_IN
+#define CFG_TUD_AUDIO_FUNC_1_EP_IN_SW_BUF_SZ          4 * CFG_TUD_AUDIO_EP_SZ_IN    // Minimum 4*EP size is needed for flow control
 
 #endif
 
diff --git a/src/class/audio/audio_device.c b/src/class/audio/audio_device.c
index 9712afde9..9af999992 100644
--- a/src/class/audio/audio_device.c
+++ b/src/class/audio/audio_device.c
@@ -2645,11 +2645,11 @@ static uint16_t audiod_tx_packet_size(const uint16_t* norminal_size, uint16_t da
       packet_size = norminal_size[2];
       if(norminal_size[0] == norminal_size[1])
       {
-        // nav = INT(nav) + 1
-        ctrl_blackout = 2;
+        // nav > INT(nav), eg. 44.1k, 88.2k
+        ctrl_blackout = 0;
       } else
       {
-        // nav = INT(nav)
+        // nav = INT(nav), eg. 48k, 96k
         ctrl_blackout = 10;
       }
     } else