diff --git a/doc/Firmware_manual.pptx b/doc/Firmware_manual.pptx
index d949798..fbaa98c 100644
Binary files a/doc/Firmware_manual.pptx and b/doc/Firmware_manual.pptx differ
diff --git a/firmware/src/config.c b/firmware/src/config.c
index 2da9b88..cbd69ae 100644
--- a/firmware/src/config.c
+++ b/firmware/src/config.c
@@ -23,8 +23,11 @@ static iidx_cfg_t default_cfg = {
         .brightness = 5,
         .reversed = false,
     },
-    .tt_sensor_analog = false,
-    .tt_sensor_reversed = false,
+    .tt_sensor = {
+        .analog = false,
+        .reversed = false,
+        .analog_deadzone = 0,
+    },
     .effects = {
         .play_vol = 255,
         .filter = 128,
@@ -41,6 +44,10 @@ static void config_loaded()
         iidx_cfg->tt_led.num = 24;
         config_changed();
     }
+    if (iidx_cfg->tt_sensor.analog_deadzone > 2) {
+        iidx_cfg->tt_sensor.analog_deadzone = 0;
+        config_changed();
+    }
 }
 
 void config_changed()
diff --git a/firmware/src/config.h b/firmware/src/config.h
index 7267751..e038ce8 100644
--- a/firmware/src/config.h
+++ b/firmware/src/config.h
@@ -26,8 +26,11 @@ typedef struct __attribute ((packed)) {
         uint8_t brightness;
         bool reversed;
     } tt_led;
-    bool tt_sensor_analog;
-    bool tt_sensor_reversed;
+    struct {
+        bool analog;
+        bool reversed;
+        uint8_t analog_deadzone;
+    } tt_sensor;
     struct {
         uint8_t play_vol;
         uint8_t filter;
diff --git a/firmware/src/setup.c b/firmware/src/setup.c
index b2aaa4e..93da178 100644
--- a/firmware/src/setup.c
+++ b/firmware/src/setup.c
@@ -136,8 +136,6 @@ static struct {
     bool adjust_led_start;
     int16_t start_angle;
     uint8_t counter;
-    bool e4_press_valid;
-    uint64_t e4_timeout;
 } tt_ctx;
 
 void mode_tt_enter()
@@ -153,15 +151,19 @@ static void mode_tt_key_change()
     } else if (JUST_PRESSED(E_EFFECT)) {
         tt_ctx.adjust_led_start = false;
         tt_ctx.start_angle = input.angle;
-    } else if (JUST_PRESSED(E_4)) {
-        tt_ctx.e4_press_valid = true;
-        tt_ctx.e4_timeout = setup_tick_ms + 3000;
-    }
-
-    if (JUST_RELEASED(E_VEFX)) {
+    } else if (JUST_PRESSED(E_VEFX)) {
         iidx_cfg->tt_led.reversed = !iidx_cfg->tt_led.reversed;
-    } else if (JUST_RELEASED(E_4) && tt_ctx.e4_press_valid) {
-        iidx_cfg->tt_sensor_reversed = !iidx_cfg->tt_sensor_reversed;
+    } else if (JUST_PRESSED(E_4)) {
+        if (iidx_cfg->tt_sensor.reversed) {
+            iidx_cfg->tt_sensor.analog = !iidx_cfg->tt_sensor.analog;
+        }
+        iidx_cfg->tt_sensor.reversed = !iidx_cfg->tt_sensor.reversed;
+    } else if (JUST_PRESSED(KEY_2)) {
+        iidx_cfg->tt_sensor.analog_deadzone = 0;
+    } else if (JUST_PRESSED(KEY_4)) {
+        iidx_cfg->tt_sensor.analog_deadzone = 1;
+    } else if (JUST_PRESSED(KEY_6)) {
+        iidx_cfg->tt_sensor.analog_deadzone = 2;
     }
 
     check_exit();
@@ -225,16 +227,16 @@ void mode_tt_loop()
     uint32_t green = button_rgb32(0, 99, 0, false);
     uint32_t cyan = button_rgb32(0, 99, 99, false);
     uint32_t yellow = button_rgb32(99, 99, 0, false);
+    uint32_t silver = button_rgb32(60, 60, 60, false);
 
     setup_led_button[LED_E_VEFX] = iidx_cfg->tt_led.reversed ? cyan : yellow;
-    setup_led_button[LED_E_4] = iidx_cfg->tt_sensor_analog ?
-        (iidx_cfg->tt_sensor_reversed ? red : green) :
-        (iidx_cfg->tt_sensor_reversed ? yellow : cyan);
-    
-    if (PRESSED_ANY(E_4) && tt_ctx.e4_press_valid && (setup_tick_ms > tt_ctx.e4_timeout)) {
-        iidx_cfg->tt_sensor_analog = !iidx_cfg->tt_sensor_analog;
-        tt_ctx.e4_press_valid = false;
-    }
+    setup_led_button[LED_E_4] = iidx_cfg->tt_sensor.analog ?
+        (iidx_cfg->tt_sensor.reversed ? red : green) :
+        (iidx_cfg->tt_sensor.reversed ? yellow : cyan);
+
+    setup_led_button[LED_KEY_2] = iidx_cfg->tt_sensor.analog_deadzone == 0 ? silver : 0;
+    setup_led_button[LED_KEY_4] = iidx_cfg->tt_sensor.analog_deadzone == 1 ? silver : 0;
+    setup_led_button[LED_KEY_6] = iidx_cfg->tt_sensor.analog_deadzone == 2 ? silver : 0;
 }
 
 static struct {
@@ -285,14 +287,12 @@ bool setup_run(uint16_t keys, uint16_t angle)
         input.rotate += 256;
     }
 
-   if (input.rotate != 0) {
+    if (input.rotate != 0) {
         printf("@ %3d %2x\n", input.rotate, input.angle);
         mode_defs[current_mode].rotate();
     }
-
     if (input.just_pressed) {
         printf("+ %04x\n", input.just_pressed);
-        printf("S:%u L:%u\n", iidx_cfg->tt_led.start, iidx_cfg->tt_led.num);
     }
     if (input.just_released) {
         printf("- %04x\n", input.just_released);
diff --git a/firmware/src/turntable.c b/firmware/src/turntable.c
index 1d4d28f..0053f3b 100644
--- a/firmware/src/turntable.c
+++ b/firmware/src/turntable.c
@@ -42,14 +42,14 @@ static void init_analog()
 
 static void follow_mode_change()
 {
-    if (running_analog != iidx_cfg->tt_sensor_analog) {
+    if (running_analog != iidx_cfg->tt_sensor.analog) {
         turntable_init();
     }
 }
 
 void turntable_init()
 {
-    running_analog = iidx_cfg->tt_sensor_analog;
+    running_analog = iidx_cfg->tt_sensor.analog;
     if (running_analog) {
         init_analog();
     } else {
@@ -57,12 +57,44 @@ void turntable_init()
     }
 }
 
-uint32_t max_adc = 3650;
+static uint32_t min_adc = 0;  /* idealy [0..3740] */
+static uint32_t max_adc = 3740;
+static bool min_touched = false;
+static bool max_touched = false;
+
 static inline void adjust_max(uint32_t value)
 {
     if (value > max_adc) {
         max_adc += (value - max_adc + 1) / 2;
+        printf("Auto adc max: %4lu %4lu\n", min_adc, max_adc);
     }
+    max_touched = true;
+}
+
+static inline void adjust_min(uint32_t value)
+{
+    if (value < min_adc) {
+        min_adc -= (min_adc - value + 1) / 2;
+        printf("Auto adc min: %4lu %4lu\n", min_adc, max_adc);
+    }
+    min_touched = true;
+}
+
+static void auto_adjust_adc()
+{
+    if (!min_touched || !max_touched) {
+        return;
+    }
+    min_touched = false;
+    max_touched = false;
+
+    if (max_adc > 3540) {
+        max_adc--;
+    }
+    if (min_adc < 200) {
+        min_adc++;
+    }
+    printf("Auto adc adj: %4lu %4lu\n", min_adc, max_adc);
 }
 
 static uint16_t read_average(uint16_t size)
@@ -75,10 +107,10 @@ static uint16_t read_average(uint16_t size)
 
     for (int i = 0; i < size; i++) {
         uint32_t sample = adc_read();
-        if (sample > 3500) {
+        if (sample > 3540) {
             large_cnt++;
             large += sample;
-        } else if (sample < 500) {
+        } else if (sample < 200) {
             small_cnt++;
             small += sample;
         } else {
@@ -86,10 +118,14 @@ static uint16_t read_average(uint16_t size)
         }
     }
 
-    if (large_cnt > 100) {
+    if (large_cnt > 50) {
         adjust_max(large / large_cnt);
     }
 
+    if (small_cnt > 50) {
+        adjust_min(small / small_cnt);
+    }
+
     uint32_t all = large + small + medium;
 
     if (large_cnt && small_cnt) {
@@ -101,15 +137,23 @@ static uint16_t read_average(uint16_t size)
 
 static void update_analog()
 {
-    const uint16_t deadzone = 24;
     static uint16_t sample = 0;
+
+    auto_adjust_adc();
+
+    uint16_t deadzone = (iidx_cfg->tt_sensor.analog_deadzone + 1) * 16;
+
     int new_value = read_average(200);
     int delta = abs(new_value - sample);
     if ((abs(delta) < deadzone) || (abs(delta) > 4096 - deadzone)) {
         return;
     }
     sample = new_value;
-    angle = (sample * 4095) / max_adc;
+    if (sample < min_adc) {
+        angle = 0;
+        return;
+    }
+    angle = (sample - min_adc) * 4095 / (max_adc - min_adc);
 }
 
 static void update_i2c()
@@ -136,5 +180,5 @@ void turntable_update()
 
 uint16_t turntable_read()
 {
-    return iidx_cfg->tt_sensor_reversed ? 4095 - angle : angle; // 12bit
+    return iidx_cfg->tt_sensor.reversed ? 4095 - angle : angle; // 12bit
 }