Clean up LED driver + rename USB to JOC Midi

- Removed flash_sysex/flash_all/flash_one (conflicted with heartbeat)
- Simplified flash_activity: LED 0 white 50ms, restores properly
- Heartbeat only on LED 9 when no activity
- USB renamed: Manufacturer=JOC, Product=JOC Midi

include/led_stub.h

@@ -11,9 +11,6 @@ public:
     virtual void clear_all() = 0;
     virtual void set_led_brightness(uint8_t brightness) = 0;
     virtual void flash_activity() {}
-    virtual void flash_sysex() {}
-    virtual void flash_all(uint8_t r, uint8_t g, uint8_t b, uint16_t duration) {}
-    virtual void flash_one(uint8_t index, uint8_t r, uint8_t g, uint8_t b, uint16_t duration) {}
     virtual void update() {}
     
     virtual uint8_t note_to_index(uint8_t note) {
@@ -50,9 +47,6 @@ public:
     void clear_all() override;
     void set_led_brightness(uint8_t brightness) override;
     void flash_activity() override;
-    void flash_sysex() override;
-    void flash_all(uint8_t r, uint8_t g, uint8_t b, uint16_t duration) override;
-    void flash_one(uint8_t index, uint8_t r, uint8_t g, uint8_t b, uint16_t duration) override;
     void update() override;
 
     void set_mux(PixelStompMux* mux);

src/app_task.cpp

@@ -46,22 +46,8 @@ void AppTask::process_midi_event(const MidiEvent& event) {
     Serial.printf("[APP] MIDI IN: Type=%d Ch=%d Data1=%d Data2=%d\n",
                   event.type, event.channel, event.data1, event.data2);
 
-    // Visual MIDI type indicator (works without serial on iPad)
+    // Flash LED 0 white briefly on ANY MIDI input - visual activity indicator
-    if (event.type == MidiEvent::SYSEX) {
+    led_driver->flash_activity();
-        led_driver->flash_all(255, 255, 255, 200);  // SysEx = ALL white
-    } else if (event.type == MidiEvent::NOTE_ON || event.type == MidiEvent::NOTE_OFF) {
-        led_driver->flash_one(0, 255, 0, 0, 100);   // Note = LED 0 red
-    } else if (event.type == MidiEvent::CONTROL_CHANGE) {
-        led_driver->flash_one(1, 0, 255, 0, 100);   // CC = LED 1 green
-        
-        // Generic mode: Loopy Pro mirrors back on same CC with state value
-        // Visualize the velocity/CC value on LED 2-3
-        uint8_t val = event.data2;
-        if (val < 32) led_driver->flash_one(2, 255, 0, 0, 100);           // 0-31 = red (recording?)
-        else if (val < 64) led_driver->flash_one(2, 255, 128, 0, 100);    // 32-63 = amber (queued?)
-        else if (val < 96) led_driver->flash_one(2, 0, 255, 0, 100);      // 64-95 = green (playing?)
-        else led_driver->flash_one(2, 0, 0, 255, 100);                    // 96-127 = blue (other?)
-    }
     
     if (event.type == MidiEvent::SYSEX) {
         // Cin is encoded in channel for SYSEX packets

src/midi_transport.cpp

@@ -13,9 +13,9 @@ UsbMidiTransport::~UsbMidiTransport() {
 bool UsbMidiTransport::begin() {
     Serial.println("[MIDI] Setting up USB MIDI device...");
 
-    TinyUSBDevice.setManufacturerDescriptor("Novation");
+    TinyUSBDevice.setManufacturerDescriptor("JOC");
-    TinyUSBDevice.setProductDescriptor("Launchpad X");
+    TinyUSBDevice.setProductDescriptor("JOC Midi");
-    TinyUSBDevice.setSerialDescriptor("LPX00001");
+    TinyUSBDevice.setSerialDescriptor("JOCMIDI001");
     TinyUSBDevice.begin(0);
 
     if (!usb_midi.begin()) {