Beat 1 (every 4th) = full white 50ms snap, others = barely visible 6,6,6 — sharp contrast for phase detection

src/main.cpp

@@ -37,17 +37,27 @@ void midi_task(void* parameter) {
         uint32_t tick = midi_tick_count;
         uint32_t now = millis();
 
-        // Calculate beat using MIDI tick count (24 ticks per beat/PPQN)
         uint32_t current_beat = tick / 24;
 
-        // Check if we've crossed a beat boundary.
         if (current_beat != last_beat) {
             last_beat = current_beat;
             flash_start = now;
+            // Beat 1 every 4th beat = full white, others near-invisible
+            if (current_beat % 4 == 0) {
                 mux.set_led_color(6, 255, 255, 255);
+            } else {
+                mux.set_led_color(6, 6, 6, 6);
+            }
             mux.show();
         }
 
+        // After 50ms, snap to dim regardless of beat type
+        if (flash_start > 0 && now - flash_start >= 50) {
+            mux.set_led_color(6, 20, 20, 20);
+            mux.show();
+            flash_start = 0;
+        }
+
         // Handle flash animation
         if (flash_start > 0) {
             uint32_t elapsed = now - flash_start;