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Clean Morse tone · optional stereo field · practice or test
idle · no account · browser-local mastery
Audio Profile
Optional stereo field (headphones) · separate from Morse tone
Tone Hz is the Morse carrier · field is the optional stereo experiment · headphones help
Anonymous organism hook: one latest hashed row per visitor (HMAC of network+agent, never raw IP). Optional field telemetry — may stay idle until enough practice rows land; never claims live mastery it does not have. No account · no recovery · no identity desk.
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Characters · pick a script · tap next
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Words · pick a language · tap next