How do I add the heartbeat to a video?

To be able to add the heartbeat to a video there are two options;

1. If there is an audio output on the ultrasound (red and white audio out) you can connect a cable going from the ultrasound to an audio input on a computer.  Here is a device you can get if you have this kind of connection - https://amzn.to/3mTz1Iv
2. The other option is to take a mic with a long cord connected to the computer and put the mic next to the ultrasound speaker.  Here is the type of device you would need - https://amzn.to/3BqmxfB.

When you go into the doppler where you have the heartbeat, in OBS you mute the music and unmute the audio connection from option 1 or 2. 

**Note - you can't add the audio after the exam is over**