diff --git a/lib/synth-audio.js b/lib/synth-audio.js
index d0796f9..1fe45fd 100644
--- a/lib/synth-audio.js
+++ b/lib/synth-audio.js
@@ -302,8 +302,7 @@ const synthMicrosoft = async(logger, {
       if (!content.startsWith('<speak')) content = `<speak>${text}</speak>`;
     }
     speechConfig.speechSynthesisOutputFormat = SpeechSynthesisOutputFormat.Audio16Khz32KBitRateMonoMp3;
-    const config = AudioConfig.fromAudioFileOutput(filePath);
-    const synthesizer = new SpeechSynthesizer(speechConfig, config);
+    const synthesizer = new SpeechSynthesizer(speechConfig);
 
     if (content.startsWith('<speak>')) {
       /* microsoft enforces some properties and uses voice xml element so if the user did not supply do it for them */
@@ -330,10 +329,7 @@ const synthMicrosoft = async(logger, {
             case ResultReason.SynthesizingAudioCompleted:
               stats.increment('tts.count', ['vendor:microsoft', 'accepted:yes']);
               synthesizer.close();
-              fs.readFile(filePath, (err, data) => {
-                if (err) return reject(err);
-                resolve(data);
-              });
+              resolve(result.audioData());
               break;
             default:
               logger.info({result}, 'synthAudio: (Microsoft) unexpected result');