Do I have to stop realtime translation or audio recording to use synchronized playback?
No. If you or your scopist want to listen to a spot in your realtime transcript, just go to that spot and press play. It wont affect your recording. If you want to check a spot in any other transcript that has a sound file, go ahead. Also, feel free to use earphones to monitor what your microphone is picking up during real time transcription. Your computer is an amplifier ready to help you hear even mumbling witnesses.