In 1.0.5 r2:

ComboOrgan:20: error: expected constructor, destructor, or type conversion before ';' token
ComboOrgan.ino: In function 'void setup()':
ComboOrgan:302: error: 'MIDI' was not declared in this scope
ComboOrgan:304: error: 'MIDI_CHANNEL_OMNI' was not declared in this scope
ComboOrgan.ino: In function 'void loop()':
ComboOrgan:308: error: 'MIDI' was not declared in this scope

In 1.0.6:

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Arduino: 1.0.6 (Windows 7), Board: "Arduino Uno"
ComboOrgan:20: error: expected constructor, destructor, or type conversion before ';' token
ComboOrgan.ino: In function 'void setup()':
ComboOrgan:302: error: 'MIDI' was not declared in this scope
ComboOrgan:304: error: 'MIDI_CHANNEL_OMNI' was not declared in this scope
ComboOrgan.ino: In function 'void loop()':
ComboOrgan:308: error: 'MIDI' was not declared in this scope

In 1.8.1:

Arduino: 1.8.1 (Windows 7), Board: "Arduino/Genuino Uno"

ComboOrgan:63: error: 'prog_int16_t' does not name a type

 prog_int16_t *sampleArray[NUM_OF_GENERATORS] ;

 ^

In file included from C:\Program Files\Arduino\hardware\arduino\avr\cores\arduino/Arduino.h:28:0,

                 from sketch\ComboOrgan.ino.cpp:1:

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino: In function 'void __vector_11()':

ComboOrgan:126: error: 'sampleArray' was not declared in this scope

     samValue = pgm_read_word_near(sampleArray[I] + index[I]) ; \

                                   ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:140:3: note: in expansion of macro 'GENERATE'

   GENERATE(0) ;

   ^

ComboOrgan:126: error: 'sampleArray' was not declared in this scope

     samValue = pgm_read_word_near(sampleArray[I] + index[I]) ; \

                                   ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:141:3: note: in expansion of macro 'GENERATE'

   GENERATE(1) ;

   ^

ComboOrgan:126: error: 'sampleArray' was not declared in this scope

     samValue = pgm_read_word_near(sampleArray[I] + index[I]) ; \

                                   ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:142:3: note: in expansion of macro 'GENERATE'

   GENERATE(2) ;

   ^

ComboOrgan:126: error: 'sampleArray' was not declared in this scope

     samValue = pgm_read_word_near(sampleArray[I] + index[I]) ; \

                                   ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:143:3: note: in expansion of macro 'GENERATE'

   GENERATE(3) ;

   ^

ComboOrgan:126: error: 'sampleArray' was not declared in this scope

     samValue = pgm_read_word_near(sampleArray[I] + index[I]) ; \

                                   ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:144:3: note: in expansion of macro 'GENERATE'

   GENERATE(4) ;

   ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino: In function 'void ConfigGenerator(int, int)':

ComboOrgan:177: error: 'sampleArray' was not declared in this scope

     sampleArray[i] = (prog_int16_t*)pgm_read_word_near(FarfWaves + key) ;

     ^

ComboOrgan:177: error: 'prog_int16_t' was not declared in this scope

     sampleArray[i] = (prog_int16_t*)pgm_read_word_near(FarfWaves + key) ;

                       ^

ComboOrgan:177: error: expected primary-expression before ')' token

     sampleArray[i] = (prog_int16_t*)pgm_read_word_near(FarfWaves + key) ;

                                    ^

ComboOrgan:180: error: 'sampleArray' was not declared in this scope

     sampleArray[i] = (prog_int16_t*)pgm_read_word_near(VoxWaves + key) ;

     ^

ComboOrgan:180: error: 'prog_int16_t' was not declared in this scope

     sampleArray[i] = (prog_int16_t*)pgm_read_word_near(VoxWaves + key) ;

                       ^

ComboOrgan:180: error: expected primary-expression before ')' token

     sampleArray[i] = (prog_int16_t*)pgm_read_word_near(VoxWaves + key) ;

                                    ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino: At global scope:

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:187:24: warning: unused parameter 'channel' [-Wunused-parameter]

 void handleNoteOn(byte channel, byte note, byte velocity) {

                        ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:187:49: warning: unused parameter 'velocity' [-Wunused-parameter]

 void handleNoteOn(byte channel, byte note, byte velocity) {

                                                 ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:227:25: warning: unused parameter 'channel' [-Wunused-parameter]

 void handleNoteOff(byte channel, byte note, byte velocity) {

                         ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:227:50: warning: unused parameter 'velocity' [-Wunused-parameter]

 void handleNoteOff(byte channel, byte note, byte velocity) {

                                                  ^

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino: In function 'void setup()':

ComboOrgan:286: error: 'sampleArray' was not declared in this scope

       sampleArray[i] = (prog_int16_t*)pgm_read_word_near(FarfWaves + key) ;

       ^

ComboOrgan:286: error: 'prog_int16_t' was not declared in this scope

       sampleArray[i] = (prog_int16_t*)pgm_read_word_near(FarfWaves + key) ;

                         ^

ComboOrgan:286: error: expected primary-expression before ')' token

       sampleArray[i] = (prog_int16_t*)pgm_read_word_near(FarfWaves + key) ;

                                      ^

ComboOrgan:289: error: 'sampleArray' was not declared in this scope

       sampleArray[i] = (prog_int16_t*)pgm_read_word_near(VoxWaves + key) ;

       ^

ComboOrgan:289: error: 'prog_int16_t' was not declared in this scope

       sampleArray[i] = (prog_int16_t*)pgm_read_word_near(VoxWaves + key) ;

                         ^

ComboOrgan:289: error: expected primary-expression before ')' token

       sampleArray[i] = (prog_int16_t*)pgm_read_word_near(VoxWaves + key) ;

                                      ^

In file included from C:\Program Files\Arduino\libraries\MIDI/MIDI.h:224:0,

                 from E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:20:

C:\Program Files\Arduino\libraries\MIDI/MIDI.hpp: In instantiation of 'bool midi::MidiInterface<SerialPort, Settings>::inputFilter(midi::Channel) [with SerialPort = HardwareSerial; Settings = midi::DefaultSettings; midi::Channel = unsigned char]':

C:\Program Files\Arduino\libraries\MIDI/MIDI.hpp:475:52:   required from 'bool midi::MidiInterface<SerialPort, Settings>::read(midi::Channel) [with SerialPort = HardwareSerial; Settings = midi::DefaultSettings; midi::Channel = unsigned char]'

C:\Program Files\Arduino\libraries\MIDI/MIDI.hpp:460:30:   required from 'bool midi::MidiInterface<SerialPort, Settings>::read() [with SerialPort = HardwareSerial; Settings = midi::DefaultSettings]'

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:309:13:   required from here

C:\Program Files\Arduino\libraries\MIDI/MIDI.hpp:783:70: warning: unused parameter 'inChannel' [-Wunused-parameter]

 inline bool MidiInterface<SerialPort, Settings>::inputFilter(Channel inChannel)

                                                                      ^

In file included from C:\Program Files\Arduino\libraries\MIDI/MIDI.h:224:0,

                 from E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:20:

C:\Program Files\Arduino\libraries\MIDI/MIDI.hpp: In instantiation of 'void midi::MidiInterface<SerialPort, Settings>::thruFilter(midi::Channel) [with SerialPort = HardwareSerial; Settings = midi::DefaultSettings; midi::Channel = unsigned char]':

C:\Program Files\Arduino\libraries\MIDI/MIDI.hpp:482:25:   required from 'bool midi::MidiInterface<SerialPort, Settings>::read(midi::Channel) [with SerialPort = HardwareSerial; Settings = midi::DefaultSettings; midi::Channel = unsigned char]'

C:\Program Files\Arduino\libraries\MIDI/MIDI.hpp:460:30:   required from 'bool midi::MidiInterface<SerialPort, Settings>::read() [with SerialPort = HardwareSerial; Settings = midi::DefaultSettings]'

E:\My Documents\Arduino_sketches\ComboOrgan\ComboOrgan.ino:309:13:   required from here

C:\Program Files\Arduino\libraries\MIDI/MIDI.hpp:1114:62: warning: unused parameter 'inChannel' [-Wunused-parameter]

 void MidiInterface<SerialPort, Settings>::thruFilter(Channel inChannel)

                                                              ^

exit status 1
'prog_int16_t' does not name a type

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.