Hello,
I've bought this module https://www.adafruit.com/product/2479 some weeks ago and I'm still trying to get it working with teensy LC.
Particularly I would like to use this code that works perfectly with Arduino Leonardo : https://github.com/jardous/MIDIcontroller

I don't use any of neopixel and leds so the code I use is :

Code:
#include <SPI.h>


#include <MIDI.h>
#include <midi_Defs.h>
#include <midi_Message.h>
#include <midi_Namespace.h>
#include <midi_Settings.h>


// Include the Bounce2 library found here:
// https://github.com/thomasfredericks/Bounce-Arduino-Wiring

#include <Bounce2.h>

#define DEFAULT_MIDI_CHANNEL 1
#define MIDI_CC 0xB0
#define BOUNCE_INTERVAL 10





// BLUETOOTH
#include <SoftwareSerial.h>

#include "Adafruit_BLE.h"
#include "Adafruit_BluefruitLE_UART.h"
#include "BluefruitConfig.h"
#define __BLE

#ifdef __BLE
SoftwareSerial bluefruitSS = SoftwareSerial(BLUEFRUIT_SWUART_TXD_PIN, BLUEFRUIT_SWUART_RXD_PIN);
Adafruit_BluefruitLE_UART ble(bluefruitSS, BLUEFRUIT_UART_MODE_PIN,
                      BLUEFRUIT_UART_CTS_PIN, BLUEFRUIT_UART_RTS_PIN);
// A small helper
void error(const __FlashStringHelper*err) {
  Serial.println(err);
}

/*
 * Set the new characteristic value
 * format: AT+GATTCHAR=1,AF-80-XX-YY-ZZ
 * where XX is the command, YY is note and ZZ is velocity
*/
void BLESendMIDI(unsigned char command, unsigned char param1, unsigned char param2) {
    static char *buf = "AT+GATTCHAR=1,AF-80-00-00-00";
    sprintf(buf+20, "%X-%02X-%02X", command, param1, param2);
    ble.sendCommandCheckOK(buf);
    Serial.println(buf);
}
#endif


// the controller board is 3x4 buttons
#define BOARD_ROWS 3
#define BOARD_COLS 4

typedef enum { SWITCH, STOMP } ButtonType;

void allSwitchesOff(void);

class Button : public Bounce
{

public:

  Button(int pin, ButtonType type, uint8_t cc,
         uint8_t value=0, uint8_t channel=DEFAULT_MIDI_CHANNEL)
                                    : m_type(type) , m_state(false)
                                    , m_cc(cc), m_value(value), m_channel(DEFAULT_MIDI_CHANNEL)
  {
    pinMode(pin, INPUT_PULLUP);
    attach(pin);
    interval(BOUNCE_INTERVAL);
  }

  void update(void) {
    Bounce::update();
    if (Bounce::fell()) {
      MIDI.sendControlChange(m_cc, m_value, m_channel);
#ifdef __BLE
      if (ble.isConnected() != 0) {
        Serial.println("sending CC");
        BLESendMIDI(MIDI_CC, m_cc, 127);
      }
#endif
      if (m_cc == 31) {
      }
      
      // set to off others if this is switch
      if (m_type == SWITCH) {  // switch
        allSwitchesOff();
        m_state = true;
      } else {  // stomp
        m_state = !m_state;
      }
    }
  }

  ButtonType m_type;  // 0 - switch, 1 - stomp
  bool m_state;
  uint8_t m_interval;
  uint8_t m_cc;
  uint8_t m_value;
  uint8_t m_channel;
};

Button *buttons[BOARD_ROWS * BOARD_COLS] = { NULL };

void allSwitchesOff(void) {
  for (int i=0; i<BOARD_ROWS*BOARD_COLS; i++) {
    if (buttons[i]) {
      if (buttons[i]->m_type == SWITCH) {
        buttons[i]->m_state = false;
      }
    }
  }
}




void setup() {
  Serial.begin(9600);
     MIDI.begin();

  // add buttons to the array and nstantiate the button objects
  // first row (bottom)
  buttons[0] = new Button(/*pin*/2, /*type*/SWITCH, /*cc*/1);
  buttons[1] = new Button(/*pin*/3, /*type*/STOMP, /*cc*/2);
  buttons[2] = new Button(/*pin*/4, /*type*/STOMP, /*cc*/3);
  buttons[3] = new Button(/*pin*/5, /*type*/SWITCH, /*cc*/4);
  // second row
  buttons[4] = new Button(/*pin*/6, /*type*/STOMP, /*cc*/21);
  buttons[5] = new Button(/*pin*/7, /*type*/STOMP, /*cc*/22);
  buttons[6] = new Button(/*pin*/8, /*type*/STOMP, /*cc*/23);
  buttons[7] = NULL;
  // third row (top)
  buttons[8] = new Button(/*pin*/A1, /*type*/STOMP, /*cc*/31);
  buttons[9] = new Button(/*pin*/A2, /*type*/STOMP, /*cc*/32);
  buttons[10] = NULL;
  buttons[11] = NULL;

  //Setup the LED

  MIDI.begin();
  Serial.println("ready");
 


 

#ifdef __BLE
  if ( !ble.begin(VERBOSE_MODE) )
  {
    error(F("Couldn't find Bluefruit, make sure it's in CoMmanD mode & check wiring?"));
  }

  Serial.println( F("OK!") );
  // Perform a factory reset to make sure everything is in a known state
  Serial.println(F("Performing a factory reset: "));
  if (! ble.factoryReset() ){
       error(F("Couldn't factory reset"));
  }

  // Disable command echo from Bluefruit
  ble.echo(false);

  // Print Bluefruit information
  ble.info();

  // configure GATT services and advertising
  ble.sendCommandCheckOK("AT+GATTLIST");
  ble.sendCommandCheckOK("AT+GATTADDSERVICE=UUID128=03-B8-0E-5A-ED-E8-4B-33-A7-51-6C-E3-4E-C4-C7-00");
  ble.sendCommandCheckOK("AT+GATTADDCHAR=UUID128=77-72-E5-DB-38-68-41-12-A1-A9-F2-66-9D-10-6B-F3,PROPERTIES=0x96,MIN_LEN=1,MAX_LEN=20");
  ble.sendCommandCheckOK("AT+GAPINTERVALS=8,15,250,180");
  ble.sendCommandCheckOK("AT+GAPSETADVDATA=02-01-06-11-06-00-C7-C4-4E-E3-6C-51-A7-33-4B-E8-ED-5A-0E-B8-03");
  ble.sendCommandCheckOK("AT+BLEPOWERLEVEL=4");

  ble.reset();

  ble.verbose(false);  // debug info is a little annoying after this point!
#endif __BLE
}


void loop() {
  // Update the Bounce instance
  for (int i=0; i<BOARD_ROWS*BOARD_COLS; i++) {
    if (buttons[i] != NULL) {
      buttons[i]->update();
    }
  }
}

Code compiles well with the following messages :

Code:
WARNING: Spurious .github folder in 'Adafruit BluefruitLE nRF51' library
WARNING: Spurious .github folder in 'Adafruit NeoPixel' library
C:\Users\DA\AppData\Local\Temp\arduino_modified_sketch_648058\MIDIcontroller.ino:184:8: warning: extra tokens at end of #endif directive [enabled by default]

 #endif __BLE

        ^

In file included from C:\Users\DA\Documents\Arduino\libraries\Adafruit_BluefruitLE_nRF51-master/Adafruit_BLE.h:45:0,

                 from C:\Users\DA\AppData\Local\Temp\arduino_modified_sketch_648058\MIDIcontroller.ino:27:

C:\Users\DA\Documents\Arduino\libraries\Adafruit_BluefruitLE_nRF51-master/Adafruit_ATParser.h: In member function 'bool Adafruit_ATParser::atcommand(const char*, const uint8_t*, uint16_t)':

C:\Users\DA\Documents\Arduino\libraries\Adafruit_BluefruitLE_nRF51-master/Adafruit_ATParser.h:132:45: warning: narrowing conversion of '(((int)count) + 512)' from 'int' to 'uint16_t {aka short unsigned int}' inside { } [-Wnarrowing]

     uint16_t type[] = { AT_ARGTYPE_BYTEARRAY+count };

                                             ^

C:\Users\DA\Documents\Arduino\libraries\Adafruit_BluefruitLE_nRF51-master/Adafruit_ATParser.h: In member function 'bool Adafruit_ATParser::atcommand(const __FlashStringHelper*, const uint8_t*, uint16_t)':

C:\Users\DA\Documents\Arduino\libraries\Adafruit_BluefruitLE_nRF51-master/Adafruit_ATParser.h:139:45: warning: narrowing conversion of '(((int)count) + 512)' from 'int' to 'uint16_t {aka short unsigned int}' inside { } [-Wnarrowing]

     uint16_t type[] = { AT_ARGTYPE_BYTEARRAY+count };

                                             ^

In file included from C:\Users\DA\Documents\Arduino\libraries\Adafruit_BluefruitLE_nRF51-master/Adafruit_BLE.h:45:0,

                 from C:\Users\DA\AppData\Local\Temp\arduino_modified_sketch_648058\MIDIcontroller.ino:27:

C:\Users\DA\Documents\Arduino\libraries\Adafruit_BluefruitLE_nRF51-master/Adafruit_ATParser.h: In member function 'bool Adafruit_ATParser::atcommandIntReply(const char*, int32_t*, const uint8_t*, uint16_t)':

C:\Users\DA\Documents\Arduino\libraries\Adafruit_BluefruitLE_nRF51-master/Adafruit_ATParser.h:198:45: warning: narrowing conversion of '(((int)count) + 512)' from 'int' to 'uint16_t {aka short unsigned int}' inside { } [-Wnarrowing]

     uint16_t type[] = { AT_ARGTYPE_BYTEARRAY+count };

                                             ^

C:\Users\DA\Documents\Arduino\libraries\Adafruit_BluefruitLE_nRF51-master/Adafruit_ATParser.h: In member function 'bool Adafruit_ATParser::atcommandIntReply(const __FlashStringHelper*, int32_t*, const uint8_t*, uint16_t)':

C:\Users\DA\Documents\Arduino\libraries\Adafruit_BluefruitLE_nRF51-master/Adafruit_ATParser.h:205:45: warning: narrowing conversion of '(((int)count) + 512)' from 'int' to 'uint16_t {aka short unsigned int}' inside { } [-Wnarrowing]

     uint16_t type[] = { AT_ARGTYPE_BYTEARRAY+count };

                                             ^

MIDIcontroller: In function 'void BLESendMIDI(unsigned char, unsigned char, unsigned char)':
MIDIcontroller:47: warning: deprecated conversion from string constant to 'char*' 
     static char *buf = "AT+GATTCHAR=1,AF-80-00-00-00";

                        ^


Sketch uses 19,844 bytes (31%) of program storage space. Maximum is 63,488 bytes.
Global variables use 3,516 bytes (42%) of dynamic memory, leaving 4,676 bytes for local variables. Maximum is 8,192 bytes.
Invalid library found in C:\Users\DA\Documents\Arduino\libraries\arcore-master: C:\Users\DA\Documents\Arduino\libraries\arcore-master
Invalid library found in C:\Users\DA\Documents\Arduino\libraries\arcore-master: C:\Users\DA\Documents\Arduino\libraries\arcore-master
and for the bluefruitconfig.h I have :
Code:
// COMMON SETTINGS
// ----------------------------------------------------------------------------------------------
// These settings are used in both SW UART, HW UART and SPI mode
// ----------------------------------------------------------------------------------------------
#define BUFSIZE                        128   // Size of the read buffer for incoming data
#define VERBOSE_MODE                   true  // If set to 'true' enables debug output


// SOFTWARE UART SETTINGS
// ----------------------------------------------------------------------------------------------
// The following macros declare the pins that will be used for 'SW' serial.
// You should use this option if you are connecting the UART Friend to an UNO
// ----------------------------------------------------------------------------------------------
#define BLUEFRUIT_SWUART_RXD_PIN       1   // Required for software serial!
#define BLUEFRUIT_SWUART_TXD_PIN       0   // Required for software serial!
#define BLUEFRUIT_UART_CTS_PIN         10   // Required for software serial!
#define BLUEFRUIT_UART_RTS_PIN         9    // Optional, set to -1 if unused


// HARDWARE UART SETTINGS
// ----------------------------------------------------------------------------------------------
// The following macros declare the HW serial port you are using. Uncomment
// this line if you are connecting the BLE to Leonardo/Micro or Flora
// ----------------------------------------------------------------------------------------------
#ifdef Serial1    // this makes it not complain on compilation if there's no Serial1
  #define BLUEFRUIT_HWSERIAL_NAME      Serial1
#endif


// SHARED UART SETTINGS
// ----------------------------------------------------------------------------------------------
// The following sets the optional Mode pin, its recommended but not required
// ----------------------------------------------------------------------------------------------
#define BLUEFRUIT_UART_MODE_PIN        12    // Set to -1 if unused
the iPad (midimittr app) recognize th MIDI bluetooth device but doesn't connect it (with arduino does it and work perfectly)

Could you please help me ?
Thanks,
Domenico