Bookem does not natively record voice notes, but allows you to attached saved audio files.
If you're using a voice recording app such as iOS or MacOS's Voice Memos, or any other,
Save the recording to your device
Attach the file to your client note by clicking on the paper clip and selecting 'attach file'
An alternative to this is to transcribe your notes from speech to text. Click here to learn how.
Notes is a Bookem Premium feature.