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The capture thread only checked Opus broadcast subscribers to decide whether to start cpal input. PCM tap subscribers (APRS/CW decoders) were not considered, so decoding never started without a browser audio client. Include pcm_tx receiver count in the has_receivers check. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>