diff --git a/firmware/src/leds.cpp b/firmware/src/leds.cpp
index a742223..9230cc4 100644
--- a/firmware/src/leds.cpp
+++ b/firmware/src/leds.cpp
@@ -29,10 +29,10 @@ inline void outputEnable(uint8_t pin, bool enable) {
   gpio_put(pin, !enable);
 }
 
-// we have 4-bit color depth, so 16 levels of brightness
-// we go from phase 0 to phase 3
+// we have COLOR_BITS-bit color depth, so 2^COLOR_BITS levels of brightness
+// we go from phase 0 to phase (COLOR_BITS-1)
 uint8_t brightnessPhase = 0;
-uint8_t brightnessPhaseDelays[] = {1, 10, 30, 100};
+uint8_t brightnessPhaseDelays[COLOR_BITS] = {0, 1, 6, 20, 60};
 
 // NOTE: Alignment required to allow 4-byte reads
 uint8_t framebuffer[ROW_COUNT * COL_COUNT]  __attribute__((aligned(32))) = {0};
@@ -185,7 +185,7 @@ void leds_render() {
   }
 
   // next brightness phase
-  brightnessPhase = (brightnessPhase + 1) % 4;
+  brightnessPhase = (brightnessPhase + 1) % COLOR_BITS;
 }
 
 void leds_initPusher() {
diff --git a/firmware/src/leds.h b/firmware/src/leds.h
index acab099..b421094 100644
--- a/firmware/src/leds.h
+++ b/firmware/src/leds.h
@@ -20,6 +20,7 @@
 #define COL_MODULES 2
 #define COL_COUNT COL_MODULES * 20
 
+#define COLOR_BITS 5
 #define FPS 30
 #define MS_PER_FRAME 1000 / FPS
 
diff --git a/firmware/src/leds.pio b/firmware/src/leds.pio
index 3b9881b..554e96b 100644
--- a/firmware/src/leds.pio
+++ b/firmware/src/leds.pio
@@ -2,7 +2,8 @@
 .side_set 1 opt
 .wrap_target
 public entry_point:
-  out null, 4   side 0 [0]    ; ignore 4 least significant digits
+  out null, 3   side 0 [0]    ; ignore least significant digits
   out pins, 1                 ; set bit (shifted for brightness phase by C code)
-  out null, 3   side 1 [1]    ; ignore remaining bits, latch data, allow time for latching
+  out null, 4   side 1 [1]    ; ignore remaining bits, latch data, allow time for latching
+  nop           side 0        ; return to 0 (weird glitches happen otherwise)
 .wrap
diff --git a/firmware/src/leds.pio.h b/firmware/src/leds.pio.h
index 8473de7..12b6992 100644
--- a/firmware/src/leds.pio.h
+++ b/firmware/src/leds.pio.h
@@ -13,22 +13,23 @@
 // -------------- //
 
 #define leds_px_pusher_wrap_target 0
-#define leds_px_pusher_wrap 2
+#define leds_px_pusher_wrap 3
 
 #define leds_px_pusher_offset_entry_point 0u
 
 static const uint16_t leds_px_pusher_program_instructions[] = {
             //     .wrap_target
-    0x7064, //  0: out    null, 4         side 0     
+    0x7063, //  0: out    null, 3         side 0     
     0x6001, //  1: out    pins, 1                    
-    0x7963, //  2: out    null, 3         side 1 [1] 
+    0x7964, //  2: out    null, 4         side 1 [1] 
+    0xb042, //  3: nop                    side 0     
             //     .wrap
 };
 
 #if !PICO_NO_HARDWARE
 static const struct pio_program leds_px_pusher_program = {
     .instructions = leds_px_pusher_program_instructions,
-    .length = 3,
+    .length = 4,
     .origin = -1,
 };
 
diff --git a/firmware/src/main.cpp b/firmware/src/main.cpp
index a9c7e24..1b5249a 100644
--- a/firmware/src/main.cpp
+++ b/firmware/src/main.cpp
@@ -44,18 +44,18 @@ void loop() {
     sd_loadNextAudio();
   }
 
-  // if (Serial.available() > 0) {
-  //   char c = Serial.read();
-  //   if (c == 'p') {
-  //     Serial.println("Paused. Press any key to continue.");
-  //     leds_disable();
-  //     while (Serial.available() == 0) {
-  //       Serial.read();
-  //       delay(50);
-  //     }
-  //     Serial.println("Continuing...");
-  //   }
-  // }
+  if (Serial.available() > 0) {
+    char c = Serial.read();
+    if (c == 'p') {
+      Serial.println("Paused. Press any key to continue.");
+      leds_disable();
+      while (Serial.available() == 0) {
+        Serial.read();
+        delay(50);
+      }
+      Serial.println("Continuing...");
+    }
+  }
 
   if (!gfx_decoder_handleLoop()) {
     Serial.println("Failed to load frame...");