diff --git a/stereo_mix/drivers/leds.h b/stereo_mix/drivers/leds.h
index dd7c106..6bd5b87 100644
--- a/stereo_mix/drivers/leds.h
+++ b/stereo_mix/drivers/leds.h
@@ -55,7 +55,7 @@ class Leds {
 
     htim1.Init.Prescaler = 1;
     htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
-    htim1.Init.Period = 1024; // 10 bit
+    htim1.Init.Period = 1024 - 2; // 10 bit
     htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
     HAL_TIM_PWM_Init(&htim1);
 
diff --git a/stereo_mix/ui.cc b/stereo_mix/ui.cc
index 945001a..43dc1b0 100644
--- a/stereo_mix/ui.cc
+++ b/stereo_mix/ui.cc
@@ -60,9 +60,11 @@ void UI::Poll()
     }
     if (abs(previous_pot_values[i] - adc->value(ADC_GROUP_POT + i)) > 1900) {
       previous_pot_values[i] = adc->value(ADC_GROUP_POT + i);
-      queue.AddEvent(CONTROL_POT, i, previous_pot_values[i]);
+      if(pots_touched)
+        queue.AddEvent(CONTROL_POT, i, previous_pot_values[i]);
     }
   }
+  pots_touched = true;
 }
 
 void UI::LoadState() {
@@ -112,7 +114,7 @@ void UI::OnSwitchReleased(const Event& e)
   mute[e.control_id] = !mute[e.control_id];
 
   for (size_t i = 0; i < kNumChannels; i++) {
-    last_pan_pot_touch[i] = last_vol_pot_touch[i] = 0;
+    last_pan_pot_touch[i] = last_vol_pot_touch[i] = -1;
   }
 
   SaveState();
@@ -138,7 +140,7 @@ void UI::TaskDrawLeds()
       leds->set_intensity_signed(i, pan_att_pots[i] - 32767);
     } else {
       // TODO: refactor
-      if (system_clock.milliseconds() - last_pan_pot_touch[i] < kShowChangedValueMilliseconds) {
+      if (last_pan_pot_touch[i] > 0 && system_clock.milliseconds() - last_pan_pot_touch[i] < kShowChangedValueMilliseconds) {
         // show panning
         leds->set_intensity_signed(i, pan_pots[i] - 32767);
       } else {
diff --git a/stereo_mix/ui.h b/stereo_mix/ui.h
index 2fd49f8..5baefe7 100644
--- a/stereo_mix/ui.h
+++ b/stereo_mix/ui.h
@@ -33,6 +33,8 @@ class UI {
       potControllers[i].Init(&volume_pots[i], volume_hidden_params);
       uint16_t* pan_hidden_params[] = {&pan_att_pots[i], &pan_att_pots[i], &pan_att_pots[i], &pan_att_pots[i]};
       potControllers[i + kNumChannels].Init(&pan_pots[i], pan_hidden_params);
+
+      last_pan_pot_touch[i] = last_vol_pot_touch[i] = -1;
     }
 
   }
@@ -72,8 +74,9 @@ class UI {
   uint16_t pan_att_pots[kNumChannels];
   bool mute[kNumChannels];
 
-  uint32_t last_pan_pot_touch[kNumChannels];
-  uint32_t last_vol_pot_touch[kNumChannels];
+  int64_t last_pan_pot_touch[kNumChannels];
+  int64_t last_vol_pot_touch[kNumChannels];
+  bool pots_touched;
 
   PotController<kNumChannels> potControllers[kNumChannels * 2]; // todo: count
 };