Fixes.

config.h

@@ -71,7 +71,7 @@
 //*************************************************************************************************
 #define MIDI_DEVICE_DIN Serial1
 #define MIDI_DEVICE_USB 1
-#define MIDI_DEVICE_USB_HOST 1
+//#define MIDI_DEVICE_USB_HOST 1
 #define MIDI_DEVICE_USB_HOST_SERIAL 1
 
 #ifdef MIDI_DEVICE_USB_HOST_SERIAL
@@ -80,6 +80,10 @@
 #define USB_HOST_SERIAL_FORMAT USBHOST_SERIAL_8N1
 #endif
 
+#if defined(MIDI_DEVICE_USB_HOST) && defined(MIDI_DEVICE_USB_HOST_SERIAL)
+#error Enabling MIDI_DEVICE_USB_HOST and MIDI_DEVICE_USB_HOST_SERIAL at the same time is not allowed!
+#endif
+
 //*************************************************************************************************
 //* AUDIO HARDWARE SETTINGS
 //*************************************************************************************************

midi_devices.hpp

@@ -1080,8 +1080,11 @@ FLASHMEM void setup_midi_devices(void) {
 #endif
 
 #ifdef MIDI_DEVICE_USB_HOST_SERIAL
+  Serial.println("1");
   usb_host.begin();
+  Serial.println("2");
   userial.begin(USB_HOST_SERIAL_BAUD, USB_HOST_SERIAL_FORMAT);
+  Serial.println("3");
   usbhost_midi_serial.setHandleNoteOn(handleNoteOn_MIDI_DEVICE_USB_HOST_SERIAL);
   usbhost_midi_serial.setHandleNoteOff(handleNoteOff_MIDI_DEVICE_USB_HOST_SERIAL);
   usbhost_midi_serial.setHandleControlChange(handleControlChange_MIDI_DEVICE_USB_HOST_SERIAL);
@@ -1101,7 +1104,7 @@ FLASHMEM void setup_midi_devices(void) {
   usbhost_midi_serial.setHandleActiveSensing(handleActiveSensing_MIDI_DEVICE_USB_HOST_SERIAL);
   usbhost_midi_serial.setHandleSystemReset(handleSystemReset_MIDI_DEVICE_USB_HOST_SERIAL);
   //usbhost_midi_serial.setHandleRealTimeSystem(handleRealTimeSystem_MIDI_DEVICE_USB_HOST_SERIAL);
-
+  Serial.println("4");
   usbhost_midi_serial.begin(DEFAULT_MIDI_CHANNEL);
 
 #ifdef DEBUG