Hey Guys!
I do a project now, i build a Midi controller. (I hope i can finish it :D) So I have an Arduino DUE, and yet only two buttons connected. I used this example
https://www.arduino.cc/en/Tutorial/MidiDevice
to start testing how native usb thing works.
So the problem is, that i upload the code to the programming port, and native port as well. But programs wont recognize it as a MIDI controller. I tried programs like Resolume, or Ableton Live. I thought it will be easier with this native usb port thing.
Can someone explain me what im doing wrong? 
Thx in advance (Code attached below)
Here's my "customized" code. I altered only the number of buttons:
/*
This examples shows how to make a simple seven keys MIDI keyboard with volume control
Created: 4/10/2015
Author: Arturo Guadalupi <a.guadalupi@arduino.cc>
http://www.arduino.cc/en/Tutorial/MidiDevice
*/
#include "MIDIUSB.h"
#include "PitchToNote.h"
#define NUM_BUTTONS 7
#define C8 108
#define B7 107
#define B7b 106
#define A7 105
#define A7b 104
#define G7 103
#define G7b 102
#define F7 101
#define E7 100
#define E7b 99
#define D7 98
#define D7b 97
#define C7 96
#define B6 95
#define B6b 94
#define A6 93
#define A6b 92
#define G6 91
#define G6b 90
#define F6 89
#define E6 88
#define E6b 87
#define D6 86
#define D6b 85
#define C6 84
#define B5 83
#define B5b 82
#define A5 81
#define A5b 80
#define G5 79
#define G5b 78
#define F5 77
#define E5 76
#define E5b 75
#define D5 74
#define D5b 73
#define C5 72
#define B4 71
#define B4b 70
#define A4 69
#define A4b 68
#define G4 67
#define G4b 66
#define F4 65
#define E4 64
#define E4b 63
#define D4 62
#define D4b 61
#define C4 60
#define B3 59
#define B3b 58
#define A3 57
#define A3b 56
#define G3 55
#define G3b 54
#define F3 53
#define E3 52
#define E3b 51
#define D3 50
#define D3b 49
#define C3 48
#define B2 47
#define B2b 46
#define A2 45
#define A2b 44
#define G2 43
#define G2b 42
#define F2 41
#define E2 40
#define E2b 39
#define D2 38
#define D2b 37
#define C2 36
#define B1 35
#define B1b 34
#define A1 33
#define A1b 32
#define G1 31
#define G1b 30
#define F1 29
#define E1 28
#define E1b 27
#define D1 26
#define D1b 25
#define C1 24
#define B0 23
#define B0b 22
#define A0 21
const uint8_t button1 = 2;
const uint8_t button2 = 3;
const uint8_t button3 = 4;
const uint8_t button4 = 5;
const uint8_t button5 = 6;
const uint8_t button6 = 7;
const uint8_t button7 = 8;
const int intensityPot = 0; //A0 input
const uint8_t buttons[NUM_BUTTONS] = {button1, button2, button3, button4, button5, button6, button7};
const byte notePitches[NUM_BUTTONS] = {C3, D3, E3, F3, G3, A3, B3};
uint8_t notesTime[NUM_BUTTONS];
uint8_t pressedButtons = 0x00;
uint8_t previousButtons = 0x00;
uint8_t intensity;
void setup() {
for (int i = 0; i < NUM_BUTTONS; i++)
pinMode(buttons[i], INPUT_PULLUP);
}
void loop() {
readButtons();
readIntensity();
playNotes();
}
// First parameter is the event type (0x0B = control change).
// Second parameter is the event type, combined with the channel.
// Third parameter is the control number number (0-119).
// Fourth parameter is the control value (0-127).
void controlChange(byte channel, byte control, byte value) {
midiEventPacket_t event = {0x0B, 0xB0 | channel, control, value};
MidiUSB.sendMIDI(event);
}
void readButtons()
{
for (int i = 0; i < NUM_BUTTONS; i++)
{
if (digitalRead(buttons[i]) == LOW)
{
bitWrite(pressedButtons, i, 1);
delay(50);
}
else
bitWrite(pressedButtons, i, 0);
}
}
void readIntensity()
{
int val = analogRead(intensityPot);
intensity = (uint8_t) (map(val, 0, 1023, 0, 127));
}
void playNotes()
{
for (int i = 0; i < NUM_BUTTONS; i++)
{
if (bitRead(pressedButtons, i) != bitRead(previousButtons, i))
{
if (bitRead(pressedButtons, i))
{
bitWrite(previousButtons, i , 1);
noteOn(0, notePitches[i], intensity);
MidiUSB.flush();
}
else
{
bitWrite(previousButtons, i , 0);
noteOff(0, notePitches[i], 0);
MidiUSB.flush();
}
}
}
}
// First parameter is the event type (0x09 = note on, 0x08 = note off).
// Second parameter is note-on/note-off, combined with the channel.
// Channel can be anything between 0-15. Typically reported to the user as 1-16.
// Third parameter is the note number (48 = middle C).
// Fourth parameter is the velocity (64 = normal, 127 = fastest).
void noteOn(byte channel, byte pitch, byte velocity) {
midiEventPacket_t noteOn = {0x09, 0x90 | channel, pitch, velocity};
MidiUSB.sendMIDI(noteOn);
}
void noteOff(byte channel, byte pitch, byte velocity) {
midiEventPacket_t noteOff = {0x08, 0x80 | channel, pitch, velocity};
MidiUSB.sendMIDI(noteOff);
}