diff --git a/firmware/Src/bd3491.c b/firmware/Src/bd3491.c
index 0cac892..9ac070b 100644
--- a/firmware/Src/bd3491.c
+++ b/firmware/Src/bd3491.c
@@ -64,8 +64,11 @@ int bd_set_gain(I2C_HandleTypeDef * handle, uint8_t gain_in_db) {
 uint8_t bd_set_attenuation(I2C_HandleTypeDef * handle, uint8_t right_channel, uint8_t attenuation_in_db) {
 	if ((attenuation_in_db&0x7F) > 87)
 		attenuation_in_db = BD_INF_ATTENUATION;
-
-	bd_write_reg(handle, 0x21 + right_channel, attenuation_in_db | 0x80);
+	
+	if (right_channel) 
+		right_channel = 1;
+	
+	bd_write_reg(handle, 0x22 - right_channel, attenuation_in_db | 0x80);
 	return attenuation_in_db;
 }
 
@@ -83,7 +86,7 @@ uint8_t bd_set_treble_boost(I2C_HandleTypeDef * handle, uint8_t gain) {
 	if (gain > 0x07) gain = 0x07;
 
 	bd_write_reg(handle, 0x57, (gain == 0)?(0x80):(0x00) | (gain&0x07) << 1);
-	
+
 	return gain;
 }