815efdb1ae
- Set STEREO_DIFF_BW_HZ = AUDIO_BW_HZ so both filter paths have identical group delay (improves multitone separation by ~10 dB). - Zero out STEREO_SEPARATION_PHASE_TRIM (unnecessary with matched filters). - Replace gradual blend ramp with binary blend: full stereo at pilot lock, mono when unlocked. The hysteresis thresholds already handle noisy signals. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Stan Grams <sjg@haxx.space>