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call_send_audio_batch shipped a fixed 82-byte bin8 payload+length, correct only for 8-B/frame Codec2 (3200/1600). The ULBW default is 700C at 4 B/frame -> a 42-B batch, so every packet carried 40 B of uninitialized stack and a bin8 length that lied (82 vs 42): pyxis<->pyxis decoded to SILENCE (RX 6400 > 5120 output guard -> ring underrun), pyxis->a length-driven peer (Columba/Python) decoded 10 real + 10 stack-noise frames = audible GARBAGE. Use the batch_len the caller already computes. ULBW stays default (LoRa-first). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UWZuYkHBRqNb6BZHV8sTG5