The listener, previously powerless in front of the musical flow, may be able to communicate something directly to the artist. The latter, face to face with his interlocutor, perceives an outcome other than his own contribution.
Music interaction, as well as the feelings arising from it, must not be clear, simple, obvious, but based on suggestions, micro-variations that can become macro-changes, moments of stasis and moments of evolution, seconds of greater and lesser control, with the awareness of what you are listening to.
The audience communicates through the environment, which collects variations and interpolations between different types of data. Human-machine but also audience-artist interactions are thought to be less artificial and self-conditioned.