The Sun Seeker
THE SUN SEEKER IS AN ARTIFACT INVOLVED IN MANY STORIES...
Before she left him, she recorded a sound letter in the Sun Seeker, a device they bought when they were in Kepler-34b for vacation. However, he could never listen to her message.
The story suggests that he could never listen to the message because he never reached the same heartbeat with which she encrypted it. Thus, this process is an exercise for making real the faculties that a fiction artifact can have.
“ Dr. Rogers discovered how to send Sound frequencies to other planets, one day he received on the device he created, a sound letter from a very distant sun. ”
“ A human body can produce the same frequency of the sun.”
“ Professor Kane discovered how to reach the sun through the sound. ”
“ When the waves of two beings vibrate at the same frequency, those waves can travel long distances even from one sun to another..”
"What I have discovered is that this artifact sends signals of the body frequencies to other planets, as sound, and also, it sends and receives sound letters."
HOW TO ENCRYPT A MESSAGE BY USING YOUR HEARTBEAT
Look also at the documentation in The Dynamic Archive.