diff --git a/arch/arm/boot/dts/amlogic/g12b_a311d_w400.dts b/arch/arm/boot/dts/amlogic/g12b_a311d_w400.dts
index d81d163552ac..f46b8bae1772 100644
--- a/arch/arm/boot/dts/amlogic/g12b_a311d_w400.dts
+++ b/arch/arm/boot/dts/amlogic/g12b_a311d_w400.dts
@@ -1089,6 +1089,8 @@
 		datain_chmask = <0xf>;
 		/* config which data pin for loopback */
 		datain-lane-mask-in = <1 0 1 0>;
+		/* define loopack with pdm mic. */
+		mic-src = <&aml_pdm>;
 
 		/* calc mclk for datalb */
 		mclk-fs = <256>;
diff --git a/arch/arm/boot/dts/amlogic/g12b_a311d_w400_a.dts b/arch/arm/boot/dts/amlogic/g12b_a311d_w400_a.dts
index 63222e765930..4af01f5b2edf 100644
--- a/arch/arm/boot/dts/amlogic/g12b_a311d_w400_a.dts
+++ b/arch/arm/boot/dts/amlogic/g12b_a311d_w400_a.dts
@@ -1083,6 +1083,8 @@
 		datain_chmask = <0xf>;
 		/* config which data pin for loopback */
 		datain-lane-mask-in = <1 0 1 0>;
+		/* define loopack with pdm mic. */
+		mic-src = <&aml_pdm>;
 
 		/* calc mclk for datalb */
 		mclk-fs = <256>;
diff --git a/arch/arm/boot/dts/amlogic/sm1_s905d3_ac202.dts b/arch/arm/boot/dts/amlogic/sm1_s905d3_ac202.dts
index c0cc5f9ed647..48d15b758eeb 100644
--- a/arch/arm/boot/dts/amlogic/sm1_s905d3_ac202.dts
+++ b/arch/arm/boot/dts/amlogic/sm1_s905d3_ac202.dts
@@ -1236,6 +1236,8 @@
 		datain_chmask = <0xf>;
 		/* config which data pin for loopback */
 		datain-lane-mask-in = <1 1 0 0>;
+		/* define loopack with pdm mic. */
+		mic-src = <&aml_pdm>;
 
 		/* calc mclk for datalb */
 		mclk-fs = <256>;
diff --git a/arch/arm/boot/dts/amlogic/sm1_s905d3_ac202_1g.dts b/arch/arm/boot/dts/amlogic/sm1_s905d3_ac202_1g.dts
index b65c3ae63248..5409c0ac196c 100644
--- a/arch/arm/boot/dts/amlogic/sm1_s905d3_ac202_1g.dts
+++ b/arch/arm/boot/dts/amlogic/sm1_s905d3_ac202_1g.dts
@@ -1235,6 +1235,8 @@
 		datain_chmask = <0xf>;
 		/* config which data pin for loopback */
 		datain-lane-mask-in = <1 1 0 0>;
+		/* define loopack with pdm mic. */
+		mic-src = <&aml_pdm>;
 
 		/* calc mclk for datalb */
 		mclk-fs = <256>;
diff --git a/arch/arm64/boot/dts/amlogic/g12b_a311d_w400.dts b/arch/arm64/boot/dts/amlogic/g12b_a311d_w400.dts
index 5d80550b5426..1c494d0015fe 100644
--- a/arch/arm64/boot/dts/amlogic/g12b_a311d_w400.dts
+++ b/arch/arm64/boot/dts/amlogic/g12b_a311d_w400.dts
@@ -1091,6 +1091,8 @@
 		datain_chmask = <0xf>;
 		/* config which data pin for loopback */
 		datain-lane-mask-in = <1 0 1 0>;
+		/* define loopack with pdm mic. */
+		mic-src = <&aml_pdm>;
 
 		/* calc mclk for datalb */
 		mclk-fs = <256>;
diff --git a/arch/arm64/boot/dts/amlogic/g12b_a311d_w400_a.dts b/arch/arm64/boot/dts/amlogic/g12b_a311d_w400_a.dts
index 01ad8af9cd0a..f4588c978a94 100644
--- a/arch/arm64/boot/dts/amlogic/g12b_a311d_w400_a.dts
+++ b/arch/arm64/boot/dts/amlogic/g12b_a311d_w400_a.dts
@@ -1085,6 +1085,8 @@
 		datain_chmask = <0xf>;
 		/* config which data pin for loopback */
 		datain-lane-mask-in = <1 0 1 0>;
+		/* define loopack with pdm mic. */
+		mic-src = <&aml_pdm>;
 
 		/* calc mclk for datalb */
 		mclk-fs = <256>;
diff --git a/arch/arm64/boot/dts/amlogic/sm1_s905d3_ac202.dts b/arch/arm64/boot/dts/amlogic/sm1_s905d3_ac202.dts
index 8351d2f3323a..7cc45fa00daf 100644
--- a/arch/arm64/boot/dts/amlogic/sm1_s905d3_ac202.dts
+++ b/arch/arm64/boot/dts/amlogic/sm1_s905d3_ac202.dts
@@ -1232,6 +1232,8 @@
 		datain_chmask = <0xf>;
 		/* config which data pin for loopback */
 		datain-lane-mask-in = <1 1 0 0>;
+		/* define loopack with pdm mic. */
+		mic-src = <&aml_pdm>;
 
 		/* calc mclk for datalb */
 		mclk-fs = <256>;
diff --git a/arch/arm64/boot/dts/amlogic/sm1_s905d3_ac202_1g.dts b/arch/arm64/boot/dts/amlogic/sm1_s905d3_ac202_1g.dts
index 57a4f6bbd268..fc96671cbb61 100644
--- a/arch/arm64/boot/dts/amlogic/sm1_s905d3_ac202_1g.dts
+++ b/arch/arm64/boot/dts/amlogic/sm1_s905d3_ac202_1g.dts
@@ -1233,6 +1233,8 @@
 		datain_chmask = <0xf>;
 		/* config which data pin for loopback */
 		datain-lane-mask-in = <1 1 0 0>;
+		/* define loopack with pdm mic. */
+		mic-src = <&aml_pdm>;
 
 		/* calc mclk for datalb */
 		mclk-fs = <256>;
diff --git a/sound/soc/amlogic/auge/loopback.c b/sound/soc/amlogic/auge/loopback.c
index 2dd0c77253b9..a63bd89c8e11 100644
--- a/sound/soc/amlogic/auge/loopback.c
+++ b/sound/soc/amlogic/auge/loopback.c
@@ -34,6 +34,7 @@
 #include "resample.h"
 
 #include "vad.h"
+#include "pdm.h"
 
 #define DRV_NAME "loopback"
 
@@ -66,6 +67,7 @@ struct loopback {
 	unsigned int datain_chmask;
 	unsigned int datain_lane_mask; /* related with data lane */
 
+	void *mic_src;
 	/*
 	 * datalb
 	 */
@@ -633,6 +635,11 @@ static void datatin_pdm_cfg(
 	unsigned int bit_depth = snd_pcm_format_width(runtime->format);
 	unsigned int osr;
 	struct pdm_info info;
+	struct aml_pdm *pdm = (struct aml_pdm *)p_loopback->mic_src;
+	int gain_index = 0;
+
+	if (pdm)
+		gain_index = pdm->pdm_gain_index;
 
 	info.bitdepth	  = bit_depth;
 	info.channels	  = p_loopback->datain_chnum;
@@ -645,7 +652,7 @@ static void datatin_pdm_cfg(
 	/* filter for pdm */
 	osr = pdm_get_ors(p_loopback->dclk_idx, runtime->rate);
 
-	aml_pdm_filter_ctrl(osr, 1);
+	aml_pdm_filter_ctrl(gain_index, osr, 1);
 }
 
 static int loopback_dai_prepare(
@@ -1452,6 +1459,8 @@ static int loopback_platform_probe(struct platform_device *pdev)
 	struct loopback_chipinfo *p_chipinfo = NULL;
 	struct device_node *node_prt = NULL;
 	struct platform_device *pdev_parent = NULL;
+	struct device_node *np_src = NULL;
+	struct platform_device *dev_src = NULL;
 	struct aml_audio_controller *actrl = NULL;
 	int ret = 0;
 
@@ -1461,6 +1470,14 @@ static int loopback_platform_probe(struct platform_device *pdev)
 	if (!p_loopback)
 		return -ENOMEM;
 
+	np_src = of_parse_phandle(node, "mic-src", 0);
+	if (np_src) {
+		dev_src = of_find_device_by_node(np_src);
+		of_node_put(np_src);
+		p_loopback->mic_src = platform_get_drvdata(dev_src);
+		pr_debug("%s(), mic_src found\n", __func__);
+	}
+
 	/* match data */
 	p_chipinfo = (struct loopback_chipinfo *)
 		of_device_get_match_data(dev);
diff --git a/sound/soc/amlogic/auge/pdm.c b/sound/soc/amlogic/auge/pdm.c
index 18d23f63a62d..822541181435 100644
--- a/sound/soc/amlogic/auge/pdm.c
+++ b/sound/soc/amlogic/auge/pdm.c
@@ -38,9 +38,12 @@
 #include "regs.h"
 #include "ddr_mngr.h"
 #include "vad.h"
+#include "pdm_hw_coeff.h"
 
 /*#define __PTM_PDM_CLK__*/
 
+#define DRV_NAME "snd_pdm"
+
 static struct snd_pcm_hardware aml_pdm_hardware = {
 	.info			=
 					SNDRV_PCM_INFO_MMAP |
@@ -269,7 +272,7 @@ static void pdm_set_lowpower_mode(struct aml_pdm *p_pdm, bool isLowPower)
 			osr = 192;
 
 		filter_mode = p_pdm->isLowPower ? 4 : p_pdm->filter_mode;
-		aml_pdm_filter_ctrl(osr, filter_mode);
+		aml_pdm_filter_ctrl(p_pdm->pdm_gain_index, osr, filter_mode);
 
 		/* update sample count */
 		pdm_set_channel_ctrl(
@@ -371,6 +374,33 @@ static int pdm_train_set_enum(
 	return 0;
 }
 
+/*  set pdm gain index. */
+static int pdm_gain_get_enum(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
+{
+    struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+    struct aml_pdm *p_pdm = dev_get_drvdata(component->dev);
+
+    ucontrol->value.integer.value[0] = p_pdm->pdm_gain_index;
+
+    return 0;
+}
+
+static int pdm_gain_set_enum(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
+{
+        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+        struct aml_pdm *p_pdm = dev_get_drvdata(component->dev);
+        int value = ucontrol->value.integer.value[0];
+
+        if (value < 0 || value > (NUM_PDM_GAIN_INDEX - 1)) {
+                pr_info("%s, invalid value: %d [Range:0~48]", __func__, value);
+                return 0;
+        }
+
+        p_pdm->pdm_gain_index = value;
+
+        return 0;
+}
+
 static const struct snd_kcontrol_new snd_pdm_controls[] = {
 	/* which set */
 	SOC_ENUM_EXT("PDM Filter Mode",
@@ -403,6 +433,12 @@ static const struct snd_kcontrol_new snd_pdm_controls[] = {
 		     pdm_bypass_enum,
 		     pdm_bypass_get_enum,
 		     pdm_bypass_set_enum),
+    /*  index of pdm_gain_table[49], index: 0~48 */
+    SOC_SINGLE_EXT("PDM Gain",
+                 SND_SOC_NOPM, 0,
+                 (NUM_PDM_GAIN_INDEX - 1), 0,
+                 pdm_gain_get_enum,
+                 pdm_gain_set_enum)
 };
 
 #if 0
@@ -925,7 +961,7 @@ static int aml_pdm_dai_prepare(
 								dclk_idx);
 
 		aml_pdm_ctrl(&info);
-		aml_pdm_filter_ctrl(osr, filter_mode);
+        aml_pdm_filter_ctrl(p_pdm->pdm_gain_index, osr, filter_mode);
 
 		if (p_pdm->chipinfo && p_pdm->chipinfo->truncate_data)
 			pdm_init_truncate_data(runtime->rate);
diff --git a/sound/soc/amlogic/auge/pdm.h b/sound/soc/amlogic/auge/pdm.h
index e39153a030c4..30f8f57775c3 100644
--- a/sound/soc/amlogic/auge/pdm.h
+++ b/sound/soc/amlogic/auge/pdm.h
@@ -22,8 +22,6 @@
 #include <linux/pinctrl/consumer.h>
 
 
-#define DRV_NAME "snd_pdm"
-
 #define DEFAULT_FS_RATIO		256
 
 #define PDM_CHANNELS_MIN		1
@@ -97,6 +95,7 @@ struct aml_pdm {
 
 	/* low power mode, for dclk_sycpll to 24m */
 	bool isLowPower;
+    int pdm_gain_index;
 };
 
 #endif /*__AML_PDM_H__*/
diff --git a/sound/soc/amlogic/auge/pdm_hw.c b/sound/soc/amlogic/auge/pdm_hw.c
index b05e84b132b5..d1db286bda35 100644
--- a/sound/soc/amlogic/auge/pdm_hw.c
+++ b/sound/soc/amlogic/auge/pdm_hw.c
@@ -159,13 +159,12 @@ void aml_pdm_arb_config(struct aml_audio_controller *actrl)
 }
 
 /* config for hcic, lpf1,2,3, hpf */
-static void aml_pdm_filters_config(int osr,
+static void aml_pdm_filters_config(int pdm_gain_index, int osr,
 	int lpf1_len, int lpf2_len, int lpf3_len)
 {
 	int32_t hcic_dn_rate;
 	int32_t hcic_tap_num;
 	int32_t hcic_gain;
-	int32_t hcic_shift;
 	int32_t f1_tap_num;
 	int32_t f2_tap_num;
 	int32_t f3_tap_num;
@@ -183,62 +182,35 @@ static void aml_pdm_filters_config(int osr,
 	switch (osr) {
 	case 32:
 		hcic_dn_rate = 0x4;
-		hcic_gain	 = 0x80;
-		hcic_shift	 = 0xe;
-		break;
-	case 40:
-		hcic_dn_rate = 0x5;
-		hcic_gain	 = 0x6b;
-		hcic_shift	 = 0x10;
-		break;
-	case 48:
-		hcic_dn_rate = 0x6;
-		hcic_gain	 = 0x78;
-		hcic_shift	 = 0x12;
-		break;
-	case 56:
-		hcic_dn_rate = 0x7;
-		hcic_gain	 = 0x51;
-		hcic_shift	 = 0x13;
+		hcic_gain	 = pdm_gain_table[pdm_gain_index][PDM_OSR_32];
 		break;
 	case 64:
 		hcic_dn_rate = 0x0008;
-		hcic_gain	 = 0x80;
-		hcic_shift	 = 0x15;
+		hcic_gain	 = pdm_gain_table[pdm_gain_index][PDM_OSR_64];
 		break;
 	case 96:
 		hcic_dn_rate = 0x000c;
-		hcic_gain	 = 0x78;
-		hcic_shift	 = 0x19;
+		hcic_gain	 = pdm_gain_table[pdm_gain_index][PDM_OSR_96];
 		break;
 	case 128:
 		hcic_dn_rate = 0x0010;
-		hcic_gain	 = 0x80;
-		hcic_shift	 = 0x1c;
+		hcic_gain	 = pdm_gain_table[pdm_gain_index][PDM_OSR_128];
 		break;
 	case 192:
 		hcic_dn_rate = 0x0018;
-		hcic_gain	 = 0x78;
-		hcic_shift	 = 0x20;
+		hcic_gain	 = pdm_gain_table[pdm_gain_index][PDM_OSR_192];
 		break;
 	case 384:
 		hcic_dn_rate = 0x0030;
-		hcic_gain	 = 0x78;
-		hcic_shift	 = 0x27;
+		hcic_gain	 = pdm_gain_table[pdm_gain_index][PDM_OSR_384];
 		break;
 	default:
 		pr_info("Not support osr:%d, translate to :192\n", osr);
 		hcic_dn_rate = 0x0018;
-		hcic_gain	 = 0x78;
-		hcic_shift	 = 0x20;
+		hcic_gain	 = pdm_gain_table[pdm_gain_index][PDM_OSR_192];
 		break;
 	}
 
-	/* TODO: fixed hcic_shift 'cause of Dmic */
-	if (pdm_hcic_shift_gain)
-		hcic_shift -= 0x4;
-
-
 	hcic_tap_num = 0x0007;
 	f1_tap_num	 = lpf1_len;
 	f2_tap_num	 = lpf2_len;
@@ -259,8 +231,7 @@ static void aml_pdm_filters_config(int osr,
 		(0x80000000 |
 		hcic_tap_num |
 		(hcic_dn_rate << 4) |
-		(hcic_gain << 16) |
-		(hcic_shift << 24))
+		(hcic_gain << 16))
 		);
 
 	/* lpf */
@@ -347,7 +318,7 @@ static void aml_pdm_LPF_coeff(
 
 }
 
-void aml_pdm_filter_ctrl(int osr, int mode)
+void aml_pdm_filter_ctrl(int pdm_gain_index, int osr, int mode)
 {
 	int lpf1_len, lpf2_len, lpf3_len;
 	const int *lpf1_coeff, *lpf2_coeff, *lpf3_coeff;
@@ -369,6 +340,7 @@ void aml_pdm_filter_ctrl(int osr, int mode)
 	 */
 
 	switch (osr) {
+	case 32:
 	case 64:
 		lpf2_coeff = lpf2_osr64;
 		break;
@@ -387,10 +359,6 @@ void aml_pdm_filter_ctrl(int osr, int mode)
 	case 384:
 		lpf2_coeff = lpf2_osr384;
 		break;
-	case 32:
-	case 40:
-	case 48:
-	case 56:
 	default:
 		pr_info("osr :%d , lpf2 uses default parameters with osr64\n",
 			osr);
@@ -445,7 +413,9 @@ void aml_pdm_filter_ctrl(int osr, int mode)
 	}
 
 	/* config filter */
-	aml_pdm_filters_config(osr,
+	aml_pdm_filters_config(
+		pdm_gain_index,
+		osr,
 		lpf1_len,
 		lpf2_len,
 		lpf3_len);
@@ -537,11 +507,11 @@ int pdm_dclkidx2rate(int idx)
 	return rate;
 }
 
-int pdm_get_sample_count(int isLowPower, int dclk_idx)
+int pdm_get_sample_count(int is_low_power, int dclk_idx)
 {
 	int count = 0;
 
-	if (isLowPower)
+	if (is_low_power)
 		count = 0;
 	else if (dclk_idx == 1)
 		count = 38;
@@ -576,12 +546,12 @@ int pdm_get_ors(int dclk_idx, int sample_rate)
 	} else {
 		if (sample_rate == 96000)
 			osr = 32;
-		else if (sample_rate == 64000)
-			osr = 48;
 		else if (sample_rate == 48000)
 			osr = 64;
 		else if (sample_rate == 32000)
 			osr = 96;
+		else if (sample_rate == 24000)
+			osr = 128;
 		else if (sample_rate == 16000)
 			osr = 192;
 		else if (sample_rate == 8000)
diff --git a/sound/soc/amlogic/auge/pdm_hw.h b/sound/soc/amlogic/auge/pdm_hw.h
index 2f0c89710aa5..3c6d5e04629d 100644
--- a/sound/soc/amlogic/auge/pdm_hw.h
+++ b/sound/soc/amlogic/auge/pdm_hw.h
@@ -41,7 +41,7 @@ extern void aml_pdm_arb_config(struct aml_audio_controller *actrl);
 
 extern int aml_pmd_set_HPF_filter_parameters(void *array);
 
-extern void aml_pdm_filter_ctrl(int osr, int set);
+void aml_pdm_filter_ctrl(int pdm_gain_index, int osr, int set);
 
 extern void pdm_enable(int is_enable);
 
diff --git a/sound/soc/amlogic/auge/pdm_hw_coeff.h b/sound/soc/amlogic/auge/pdm_hw_coeff.h
index 5b4195cbef48..ab45d54b4f24 100644
--- a/sound/soc/amlogic/auge/pdm_hw_coeff.h
+++ b/sound/soc/amlogic/auge/pdm_hw_coeff.h
@@ -278,4 +278,70 @@ static const int lpf3_mode4[] = {
 	0xffb7a1, 0xffd46b
 };
 
+#define NUM_PDM_GAIN_INDEX 49
+#define NUM_PDM_OSR_INDEX 6
+
+enum {
+	PDM_OSR_384 = 0,
+	PDM_OSR_192,
+	PDM_OSR_128,
+	PDM_OSR_96,
+	PDM_OSR_64,
+	PDM_OSR_32
+};
+
+/* min: 0 dB; max: 24 dB; step = 0.5 dB/step */
+static const int pdm_gain_table[NUM_PDM_GAIN_INDEX][NUM_PDM_OSR_INDEX] = {
+/* osr: 384,    192,    128,    96,      64,    32 */
+	{ 0x2778, 0x2078, 0x1c80, 0x1978, 0x1580, 0xe80,}, // 0dB
+	{ 0x277f, 0x207f, 0x1b44, 0x197f, 0x1444, 0xd44,}, // 0.5dB
+	{ 0x2643, 0x1f43, 0x1b48, 0x1843, 0x1448, 0xd48,}, // 1dB
+	{ 0x2647, 0x1f47, 0x1b4c, 0x1847, 0x144c, 0xd4c,}, // 1.5dB
+	{ 0x264c, 0x1f4c, 0x1b51, 0x184c, 0x1451, 0xd51,}, // 2dB
+	{ 0x2650, 0x1f50, 0x1b55, 0x1850, 0x1455, 0xd55,}, // 2.5dB
+	{ 0x2655, 0x1f55, 0x1b5a, 0x1855, 0x145a, 0xd5a,}, // 3dB
+	{ 0x265a, 0x1f5a, 0x1b60, 0x185a, 0x1460, 0xd60,}, // 3.5dB
+	{ 0x265f, 0x1f5f, 0x1b65, 0x185f, 0x1465, 0xd65,}, // 4dB
+	{ 0x2665, 0x1f65, 0x1b6b, 0x1865, 0x146b, 0xd6b,}, // 4.5dB
+	{ 0x266b, 0x1f6b, 0x1b72, 0x186b, 0x1472, 0xd72,}, // 5dB
+	{ 0x2671, 0x1f71, 0x1b79, 0x1871, 0x1479, 0xd79,}, // 5.5dB
+	{ 0x2678, 0x1f78, 0x1b80, 0x1878, 0x1480, 0xd80,}, // 6dB
+	{ 0x267f, 0x1f7f, 0x1a44, 0x187f, 0x1344, 0xc44,}, // 6.5dB
+	{ 0x2543, 0x1e43, 0x1a48, 0x1743, 0x1348, 0xc48,}, // 7dB
+	{ 0x2547, 0x1e47, 0x1a4c, 0x1747, 0x134c, 0xc4c,}, // 7.5dB
+	{ 0x254b, 0x1e4b, 0x1a50, 0x174b, 0x1350, 0xc50,}, // 8dB
+	{ 0x2550, 0x1e50, 0x1a55, 0x1750, 0x1355, 0xc55,}, // 8.5dB
+	{ 0x2555, 0x1e55, 0x1a5a, 0x1755, 0x135a, 0xc5a,}, // 9dB
+	{ 0x255a, 0x1e5a, 0x1a60, 0x175a, 0x1360, 0xc60,}, // 9.5dB
+	{ 0x255f, 0x1e5f, 0x1a65, 0x175f, 0x1365, 0xc65,}, // 10dB
+	{ 0x2564, 0x1e64, 0x1a6b, 0x1764, 0x136b, 0xc6b,}, // 10.5dB
+	{ 0x256a, 0x1e6a, 0x1a72, 0x176a, 0x1372, 0xc72,}, // 11dB
+	{ 0x2571, 0x1e71, 0x1a78, 0x1771, 0x1378, 0xc78,}, // 11.5dB
+	{ 0x2577, 0x1e77, 0x1a7f, 0x1777, 0x137f, 0xc7f,}, // 12dB
+	{ 0x257f, 0x1e7f, 0x1943, 0x177f, 0x1243, 0xb43,}, // 12.5dB
+	{ 0x2443, 0x1d43, 0x1947, 0x1643, 0x1247, 0xb47,}, // 13dB
+	{ 0x2447, 0x1d47, 0x194c, 0x1647, 0x124c, 0xb4c,}, // 13.5dB
+	{ 0x244b, 0x1d4b, 0x1950, 0x164b, 0x1250, 0xb50,}, // 14dB
+	{ 0x2450, 0x1d50, 0x1955, 0x1650, 0x1255, 0xb55,}, // 14.5dB
+	{ 0x2454, 0x1d54, 0x195a, 0x1654, 0x125a, 0xb5a,}, // 15dB
+	{ 0x2459, 0x1d59, 0x195f, 0x1659, 0x125f, 0xb5f,}, // 15.5dB
+	{ 0x245f, 0x1d5f, 0x1965, 0x165f, 0x1265, 0xb65,}, // 16dB
+	{ 0x2464, 0x1d64, 0x196b, 0x1664, 0x126b, 0xb6b,}, // 16.5dB
+	{ 0x246a, 0x1d6a, 0x1971, 0x166a, 0x1271, 0xb71,}, // 17dB
+	{ 0x2470, 0x1d70, 0x1978, 0x1670, 0x1278, 0xb78,}, // 17.5dB
+	{ 0x2477, 0x1d77, 0x197f, 0x1677, 0x127f, 0xb7f,}, // 18dB
+	{ 0x247e, 0x1d7e, 0x1843, 0x167e, 0x1143, 0xa43,}, // 18.5dB
+	{ 0x2343, 0x1c43, 0x1847, 0x1543, 0x1147, 0xa47,}, // 19dB
+	{ 0x2347, 0x1c47, 0x184c, 0x1547, 0x114c, 0xa4c,}, // 19.5dB
+	{ 0x234b, 0x1c4b, 0x1850, 0x154b, 0x1150, 0xa50,}, // 20dB
+	{ 0x234f, 0x1c4f, 0x1855, 0x154f, 0x1155, 0xa55,}, // 20.5dB
+	{ 0x2354, 0x1c54, 0x185a, 0x1554, 0x115a, 0xa5a,}, // 21dB
+	{ 0x2359, 0x1c59, 0x185f, 0x1559, 0x115f, 0xa5f,}, // 21.5dB
+	{ 0x235e, 0x1c5e, 0x1865, 0x155e, 0x1165, 0xa65,}, // 22dB
+	{ 0x2364, 0x1c64, 0x186b, 0x1564, 0x116b, 0xa6b,}, // 22.5dB
+	{ 0x236a, 0x1c6a, 0x1871, 0x156a, 0x1171, 0xa71,}, // 23dB
+	{ 0x2370, 0x1c70, 0x1878, 0x1570, 0x1178, 0xa78,}, // 23.5dB
+	{ 0x2377, 0x1c77, 0x187f, 0x1577, 0x117f, 0xa7f,}, // 24dB
+};
+
 #endif