Outer base A→Z, Inner base Z→A. Optional keys dedupe-in-order, then append remaining letters. Live encoding + **constant-rate digits** Morse audio of the ciphertext.
Resulting alphabets:
Ciphertext
Dot=1u, Dash=3u, intra=1u, letter=3u, word=7u.
Offset: 0
Outer = keyed A→Z; Inner = keyed Z→A. Labels are **tangent**. Borders/dividers are bold; inner ring has radial lines. Hub shows “Durden Labs” (above center) and date (below).