for (uint8_t i = 0; i < 16; i++)
    {
        for (uint8_t j = 0; j < 128; j++)
        {
            msg.deltaTime = 0;
            msg.statusByte = 0x80 | i;
            msg.data1 = j;
            msg.data2 = 0;
            [self sendMidiMsgWithEndpoint:msg output:output]; //this is my function that uses the core midi api.
        }
    }