UltraData text over ~20 kHz audio — no network, no pairing

Microphone off. Nothing will be received.
Level
—
Sync
0.00
Noise
—
Receiving, not verified yet
Nothing yet. Start listening, then send from here or from another device.
Sending & tuning
Receiving covers every profile at once, so the other end can send on whatever suits it. Nothing here has to match.
How much of the sync pattern has to agree. Reach tolerates about two wrong bits of thirteen and will occasionally invent a message out of noise; Strict tolerates none.
No rejected transmissions yet.
Transmit-side only, so it need not match. OOK needs Sharpest.