swap init order (USB before BLE), add USB ready check and debug prints

src/main.cpp

@@ -346,14 +346,14 @@ void setup() {
     switch_driver.set_mux(&mux);
     switch_driver.begin();
     
-    Serial.println("[INIT] Initializing BLE MIDI...");
-    delay(1000);
-    ble_midi_transport.begin();
-
     Serial.println("[INIT] Initializing USB MIDI...");
     midi_transport.begin();
     delay(500);
 
+    Serial.println("[INIT] Initializing BLE MIDI...");
+    delay(1000);
+    ble_midi_transport.begin();
+
     Serial.println("[INIT] Registering MIDI callbacks...");
     controller.begin();
     

src/midi_transport.cpp

@@ -91,7 +91,15 @@ void UsbMidiTransport::send_note_off(uint8_t channel, uint8_t note, uint8_t velo
 }
 
 void UsbMidiTransport::send_cc(uint8_t channel, uint8_t cc, uint8_t value) {
-    if (!initialized) return;
+    if (!initialized) {
+        Serial.println("[MIDI DBG] send_cc: not initialized");
+        return;
+    }
+    if (!TinyUSBDevice.ready()) {
+        Serial.println("[MIDI DBG] send_cc: USB not ready");
+        return;
+    }
+    Serial.println("[MIDI DBG] send_cc: calling writePacket...");
     uint8_t packet[4] = {0x0B, (uint8_t)(0xB0 | (channel - 1)), cc, value};
     usb_midi.writePacket(packet);
     Serial.printf("[MIDI OUT] Ch:%d CC:%d:%d\n", channel, cc, value);