I want to share the info for transparency but I don't expect this will be useful, not a good intro. But you are completely free to experiment.
Materially, it consists of a round mirror in the center, a ball of strands (the 'voice'), a bell and stick, 2 pawns or rocks (the "trophies"), and a handkerchief/tissues for wiping tears. The handkerchief says all emotions are welcome. Each item has a distinctly-shaped base to sit on also, for blind-accessibility.
Generally you need at least 4 players to play the instrument, and a maximum of 15 or so.
My version of the instructions (any inaccuracies are my responsibility and not of the inventors):
1 the main move is speech plus a mirroring back of what the person with the voice says. The gesture to offer mirroring is a flat hand pointing toward the speaker.
2 you can interject, short, supportive, or clarifying-question interjections when the person holding the voice is speaking, by pointing two fingers at the ball.
3 if you are emotionally overwhelmed or triggered, you can pick up one of the trophies, and hand the voice ball to someone to facilitate you through your feelings. They ask: what are you experiencing? And echo back what they hear; What are you feeling? and echo, et., What do you feel in your body? What does your breathing feel like? And echo back and repeat the cycle of questions. When you feel complete with the emotion, you put the trophy back. ( The second trophy is for a second person's need while a first person is using the first trophy)
4 the bell is for resonance or art; the ringer/stick is for silence (hold it up to pause the speech).
A feature that makes this permacultural is that it needs no electricity or hard-to-procure elements. If you don't have a ball of strands, a fruit can substitute, anything soft, for example. A bowl of water can be a mirror, or a puddle.