diff --git a/Makefile b/Makefile
index d9ebbe1..80b6b39 100644
--- a/Makefile
+++ b/Makefile
@@ -202,7 +202,7 @@ endif
 #CFLAGS += -Wpadded
 
 # catch any and all warnings
-CFLAGS += -Wextra
+#CFLAGS += -Wextra
 
 CFLAGS += -DPRINTF_INCLUDE_CONFIG_H
 CFLAGS += -DGIT_HASH=\"$(GIT_HASH)\"
diff --git a/README.md b/README.md
index 93ae5f9..31c7ea3 100644
--- a/README.md
+++ b/README.md
@@ -9,20 +9,24 @@ Anyway, have fun.
 
 # Radio performance
 
-Please note that the Quansheng uv-k radios are not professional quality transceivers, their
-performance is strictly limited, somewhat below that of a decent transceiver. The RX front
-end has no track-tuned band pass filtering at all, and so are wide band/wide open to any
-and all signals over a wide frequency range.
-Using the radio in high intensity RF environments will nearly always destroy your reception,
-the receiver simply doesn't have a great dynamic range, which means distorted AM audio with
-strong received signals, there is nothing more anyone can do in firmware/software to stop that
-happening once the RX gain adjustment I do (AM fix) reaches the hardwares limit.
+Please note that the Quansheng UV-Kx radios are not professional quality transceivers, their
+performance is strictly limited. The RX front end has no track-tuned band pass filtering
+at all, and so are wide band/wide open to any and all signals over a large frequency range.
 
-Saying that, they are nice toys for the price, fun to play with.
+Using the radio in high intensity RF environments will most likely make reception anything but
+easy (AM mode will suffer far more than FM ever will), the receiver simply doesn't have a
+great dynamic range, which results in distorted AM audio with stronger RX'ed signals.
+There is nothing more anyone can do in firmware/software to improve that, once the RX gain
+adjustment I do (AM fix) reaches the hardwares limit, your AM RX audio will be all but
+non-existant (just like Quansheng's firmware).
+On the other hand, FM RX audio will/should be fine.
+
+But, they are nice toys for the price, fun to play with.
 
 # User customization
 
-You can customize the firmware by enabling/disabling various compile options.
+You can customize the firmware by enabling/disabling various compile options, this allows
+us to remove certain firmware features in order to make room in the flash for others.
 You'll find the options at the top of "Makefile" ('0' = disable, '1' = enable) ..
 
 ```
@@ -68,7 +72,7 @@ ENABLE_COPY_CHAN_TO_VFO       := 1       copy current channel into the other VFO
 * or
 * Long-press '5' .. Toggle selected channel scanlist setting .. if NOAA is disabled in Makefile
 *
-* Long-press '*' .. Start scanning, then toggles scanlist scan 1, 2 or ALL channel scanning
+* Long-press '*' .. Start scanning, then toggles the scanning between scanlists 1, 2 or ALL channels
 
 # Some changes made from the Quansheng firmware
 
diff --git a/app/main.c b/app/main.c
index fe08b78..a11036a 100644
--- a/app/main.c
+++ b/app/main.c
@@ -68,8 +68,15 @@ static void processFKeyFunction(const KEY_Code_t Key, const bool beep)
 	uint8_t Vfo = gEeprom.TX_VFO;
 
 	if (gScreenToDisplay == DISPLAY_MENU)
+	{
+//		if (beep)
+			gBeepToPlay = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
 		return;
+	}
 	
+//	if (beep)
+		gBeepToPlay = BEEP_1KHZ_60MS_OPTIONAL;
+
 	switch (Key)
 	{
 		case KEY_0:
@@ -530,6 +537,10 @@ static void MAIN_Key_EXIT(bool bKeyPressed, bool bKeyHeld)
 
 static void MAIN_Key_MENU(const bool bKeyPressed, const bool bKeyHeld)
 {
+	if (bKeyPressed && !bKeyHeld)
+		// menu key pressed
+		gBeepToPlay = BEEP_1KHZ_60MS_OPTIONAL;
+
 	if (bKeyHeld)
 	{	// menu key held down (long press)
 
@@ -603,14 +614,10 @@ static void MAIN_Key_MENU(const bool bKeyPressed, const bool bKeyHeld)
 		const bool bFlag = (gInputBoxIndex == 0);
 		gInputBoxIndex   = 0;
 
-		gBeepToPlay = BEEP_1KHZ_60MS_OPTIONAL;
-
 		if (bFlag)
 		{
 			gFlagRefreshSetting = true;
-
 			gRequestDisplayScreen = DISPLAY_MENU;
-
 			#ifdef ENABLE_VOICE
 				gAnotherVoiceID   = VOICE_ID_MENU;
 			#endif
@@ -808,7 +815,7 @@ void MAIN_ProcessKeys(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 	{
 		if (!bKeyHeld)
 		{
-			const char Character = DTMF_GetCharacter(Key);
+			const char Character = DTMF_GetCharacter(Key - KEY_0);
 			if (Character != 0xFF)
 			{	// add key to DTMF string
 				DTMF_Append(Character);
@@ -827,7 +834,7 @@ void MAIN_ProcessKeys(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 	// TODO: ???
 	if (Key > KEY_PTT)
 	{
-		Key = KEY_SIDE2;
+		Key = KEY_SIDE2;      // what's this doing ???
 	}
 
 	switch (Key)
diff --git a/driver/gpio.h b/driver/gpio.h
index a6e6158..0d9f1d0 100644
--- a/driver/gpio.h
+++ b/driver/gpio.h
@@ -58,10 +58,10 @@ enum GPIOC_PINS {
 	GPIOC_PIN_PTT        = 5
 };
 
-void GPIO_ClearBit(volatile uint32_t *pReg, uint8_t Bit);
+void    GPIO_ClearBit(volatile uint32_t *pReg, uint8_t Bit);
 uint8_t GPIO_CheckBit(volatile uint32_t *pReg, uint8_t Bit);
-void GPIO_FlipBit(volatile uint32_t *pReg, uint8_t Bit);
-void GPIO_SetBit(volatile uint32_t *pReg, uint8_t Bit);
+void    GPIO_FlipBit( volatile uint32_t *pReg, uint8_t Bit);
+void    GPIO_SetBit(  volatile uint32_t *pReg, uint8_t Bit);
 
 #endif
 
diff --git a/driver/keyboard.c b/driver/keyboard.c
index 3b5f4b7..c6af554 100644
--- a/driver/keyboard.c
+++ b/driver/keyboard.c
@@ -22,10 +22,10 @@
 #include "driver/i2c.h"
 #include "misc.h"
 
-KEY_Code_t gKeyReading0 = KEY_INVALID;
-KEY_Code_t gKeyReading1 = KEY_INVALID;
-uint16_t   gDebounceCounter;
-bool       gWasFKeyPressed;
+KEY_Code_t gKeyReading0     = KEY_INVALID;
+KEY_Code_t gKeyReading1     = KEY_INVALID;
+uint16_t   gDebounceCounter = 0;
+bool       gWasFKeyPressed  = false;
 
 static const struct {
 
@@ -42,9 +42,8 @@ static const struct {
 
 } keyboard[] = {
 
-	// Zero row
-	{
-		// Set to zero to handle special case of nothing pulled down.
+	{	// Zero row
+		// Set to zero to handle special case of nothing pulled down
 		.set_to_zero_mask = 0xffff,
 		.pins = {
 			{ .key = KEY_SIDE1,   .pin = GPIOA_PIN_KEYBOARD_0},
@@ -120,6 +119,7 @@ KEY_Code_t KEYBOARD_Poll(void)
 
 		// Read all 4 GPIO pins at once
 		reg = GPIOA->DATA;
+
 		for (unsigned int i = 0; i < ARRAY_SIZE(keyboard[j].pins); i++)
 		{
 			const uint16_t mask = 1u << keyboard[j].pins[i].pin;
@@ -134,13 +134,13 @@ KEY_Code_t KEYBOARD_Poll(void)
 			break;
 	}
 
-	// Create I2C stop condition. Since we might have toggled I2C pins.
+	// Create I2C stop condition since we might have toggled I2C pins
 	// This leaves GPIOA_PIN_KEYBOARD_4 and GPIOA_PIN_KEYBOARD_5 high
 	I2C_Stop();
 
 	// Reset VOICE pins
 	GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_KEYBOARD_6);
-	GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_KEYBOARD_7);
+	GPIO_SetBit(  &GPIOA->DATA, GPIOA_PIN_KEYBOARD_7);
 
 	return Key;
 }
diff --git a/driver/st7565.c b/driver/st7565.c
index dd4061a..c2ccd3f 100644
--- a/driver/st7565.c
+++ b/driver/st7565.c
@@ -123,6 +123,7 @@ void ST7565_FillScreen(uint8_t Value)
 	ST7565_Init(false);
 	
 	SPI_ToggleMasterMode(&SPI0->CR, false);
+
 	for (i = 0; i < 8; i++)
 	{
 		unsigned int j;
@@ -135,6 +136,7 @@ void ST7565_FillScreen(uint8_t Value)
 		}
 		SPI_WaitForUndocumentedTxFifoStatusBit();
 	}
+
 	SPI_ToggleMasterMode(&SPI0->CR, true);
 }
 
@@ -152,6 +154,8 @@ void ST7565_Init(const bool full)
 	
 		SYSTEM_DelayMs(120);
 	}
+	else
+		SPI_ToggleMasterMode(&SPI0->CR, false);
 	
 	ST7565_WriteByte(0xA2);   // bias 9
 	ST7565_WriteByte(0xC0);   // com normal
@@ -164,9 +168,10 @@ void ST7565_Init(const bool full)
 	ST7565_WriteByte(0x24);   //
 	ST7565_WriteByte(0x81);   // volume first ?
 
+	ST7565_WriteByte(0x1f);   // contrast ?
+
 	if (full)
 	{
-		ST7565_WriteByte(0x1f);   // contrast ?
 		ST7565_WriteByte(0x2B);   // power control ?
 	
 		SYSTEM_DelayMs(1);
@@ -181,11 +186,11 @@ void ST7565_Init(const bool full)
 		ST7565_WriteByte(0x2F);   //
 	
 		SYSTEM_DelayMs(40);
-	
-		ST7565_WriteByte(0x40);   // start line ?
-		ST7565_WriteByte(0xAF);   // display on ?
 	}
 	
+	ST7565_WriteByte(0x40);   // start line ?
+	ST7565_WriteByte(0xAF);   // display on ?
+	
 	SPI_WaitForUndocumentedTxFifoStatusBit();
 
 	SPI_ToggleMasterMode(&SPI0->CR, true);
diff --git a/firmware.bin b/firmware.bin
index 61974d9..a14311b 100644
Binary files a/firmware.bin and b/firmware.bin differ
diff --git a/firmware.packed.bin b/firmware.packed.bin
index 450bac5..28c5bb7 100644
Binary files a/firmware.packed.bin and b/firmware.packed.bin differ
diff --git a/ui/inputbox.c b/ui/inputbox.c
index bc98197..c0c04e4 100644
--- a/ui/inputbox.c
+++ b/ui/inputbox.c
@@ -16,12 +16,13 @@
 
 #include <string.h>
 
+#include "driver/keyboard.h"
 #include "ui/inputbox.h"
 
 char    gInputBox[8];
 uint8_t gInputBoxIndex;
 
-void INPUTBOX_Append(char Digit)
+void INPUTBOX_Append(const char Digit)
 {
 	if (gInputBoxIndex >= sizeof(gInputBox))
 		return;
@@ -29,6 +30,6 @@ void INPUTBOX_Append(char Digit)
 	if (gInputBoxIndex == 0)
 		memset(gInputBox, 10, sizeof(gInputBox));
 
-	gInputBox[gInputBoxIndex++] = Digit;
+	gInputBox[gInputBoxIndex++] = Digit - KEY_0;
 }
 
diff --git a/ui/inputbox.h b/ui/inputbox.h
index be01fe9..4750178 100644
--- a/ui/inputbox.h
+++ b/ui/inputbox.h
@@ -22,7 +22,7 @@
 extern char    gInputBox[8];
 extern uint8_t gInputBoxIndex;
 
-void INPUTBOX_Append(char Digit);
+void INPUTBOX_Append(const char Digit);
 
 #endif