In Jain philosophy, Bhagwan Mahavir’s divya‑dhvani is not ordinary speech produced by kāy (body) or vachan (speech) like ours.

1. What is divya‑dhvani?

• After attaining keval‑jnān (omniscience), a Tirthankar’s perfect knowledge naturally “flows out” as a divine sound called divya‑dhvani.
• It is one continuous, non‑syllabic sound, but

- humans, animals, devas, etc. each understand it in their own language.

• The Gaṇdhar Bhagwants then arrange and express these teachings in normal words, which later become Āgams/Śāstras.

2. Is it through kāy‑yoga or vachan‑yoga?

In simple terms:

• Our normal talking needs:

- Mind (to think), - Speech‑organ (vachan‑yoga), - Body‑activities (kāy‑yoga).

• A Tirthankar‑Kevali is free from all ghāti karmas (knowledge‑covering, perception‑covering, deluding, etc.), and his state is completely passionless and effortless.

About divya‑dhvani:

• It is not like our intentional speech that we “decide” to speak.
• Traditional explanation:

- It arises automatically, due to the Tirthankar‑nāma‑karma and the immense puṇya of the listeners. - It is therefore said to be “beyond ordinary kāy and vachan”.

• Some ācāryas (both Digambar and Śvetāmbara) use an example:

> Like a vīṇā that sounds when touched by the wind – > the owner is not trying to play, but sound still arises. In the same way, without effort or intention, divya‑dhvani manifests from the omniscient soul.

So:

• Divya‑dhvani is not the result of karmically driven, purposeful vachan‑karma like ours.
• It is a spontaneous, non‑worldly manifestation of keval‑jnān, associated with the Tirthankar’s special body (śarīr) and nāma‑karma, not with ordinary speech or bodily action.

3. Digambar / Śvetāmbara nuance (kept simple)

• Both traditions agree:

- Tirthankar’s teaching after keval‑jnān is through divya‑dhvani. - It is understood by all beings, and Gaṇdhars systematize it.

• Technical details (like exact status of yogas in the last moments) are discussed differently in their philosophical texts,

but none describe divya‑dhvani as normal vocal speech produced by vachan‑karma like ours.

In summary: Mahavir Bhagwan did not “speak” divya‑dhvani using ordinary kāy or vachan karma. Divya‑dhvani is an automatic, divine sound emerging from his omniscient, passionless state, made understandable to all beings by their own capacity and then put into words by the Gaṇdhar Bhagwants.