audio.power(0x02);                      //power up all TLV320, just not microphone
        audio.inputVolume(0.999, 0.999);        //Set input volume to max - I don't like to use 1.0 due to rounding errors
        audio.frequency(frequency);             
        audio.format(wordWidth, (2-channels));  //note int mode = 2 - channels
       
        audio.attach(&record);                  //attach record function to audio interrupt
        for(int j = 0; j < 4096; ++j){
            circularBuffer[j] = 0;              //clear circular buffer
        }
        printf("Record\n");
        finish.mode(PullUp);         
        finish.fall(&stopRecording);            //attach stop button
        recording = true;
        audio.start(RECEIVE);                   //start recording
        streamToFile();
        printf("Stop: %d\n",write_sector);
        audio.stop();
        //while(1);
       
        printf("Playback\n");
        audio.attach(&play);                    //attach interrupt handler to send data to TLV320
        for(int j = 0; j < 4096; ++j){          //upon interrupt generation
            circularBuffer[j] = 0;              //clear circular buffer
        }
        audio.start(TRANSMIT);         <<< hang-up
        theta = 0;
        read4Pointer = 512;
        fillBuffer();                           //continually fill circular buffer
        audio.stop();
        printf("Done\n");
        while (1);