>A friend of mine sent me an audio file which supposes to tell me the time of our night out meeting, but I can't comprehend the voice in the audio file. Can you help me figure it out? I want to hang out with my friends.
> [Download file](https://tinyurl.com/2sa56kbk)
If we downlaod the wave audo file and open in Sonic-Visualiser
Next go to the `Transform` menu and `Add Spectogram` for all channels.
One we do this and zoon in a littl;e we can see a flag hidden in the spectogram.