Arc Sound that knows what time it is

At session start, Arc reads the hour and maps it to one of five time contexts — morning, midday, afternoon, evening, late night. Each combination of program × time has its own parameter profile. The agent sets them before the first note plays and tells you what it did.

Two tones, one per ear. The brain perceives the difference as a third frequency — nudging it toward the target state. The binaural offset, carrier pitch and beat ceiling all move with the agent's read of the moment. Requires headphones.

A low-pass filter tracks the session arc. At night it stays darker — warm sub frequencies, no high brightness — to protect melatonin and circadian rhythm. In the morning it opens up. The filter frequency is one of the parameters the agent adjusts per session.

Sustained pads shift mode as the brain state changes — Major for beta, Neutral for alpha, Minor for theta and delta. Felt more than heard. Notes bloom over 45-second envelopes; no event is deliberate enough to pull attention.