Audio Library DAC analogReference(EXTERNAL); not working?

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chaosmoon

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I'm trying to get 3.3V range out of a 3.2 as USB audio interface but cant't get it to switch to external and measure 1.2V

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

AudioInputUSB usb1; //xy=249.13043212890625,328.13043212890625
AudioOutputAnalog dac1; //xy=450.13043212890625,321.13043212890625
AudioConnection patchCord1(usb1, 0, dac1, 0);



void setup() {
analogReference(EXTERNAL);
AudioMemory(12);

}

void loop() {

}
 
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