Voice mode: missed detections and transcription quality issues

What's happening

Two issues with voice mode in Claude Code:

1. Missed detections: Sometimes voice input just doesn't detect anything — I'm speaking but nothing gets transcribed. No error, it just silently drops the input.

1. Transcription quality: The speech-to-text regularly garbles technical terms and homophones. Examples from a real session:

• "cache" → "cash"
• "dict" → "dick"
• "re-raise the botocore ClientError" → approximate gibberish

This is usable but rough — the workflow of talking through a code review while the agent researches is great, but the transcription friction is real.

Questions

• Does mic hardware matter here? Would a better mic improve detection/quality?
• What speech-to-text engine is being used?
• Is there anything configurable for silence detection thresholds?

Environment

• macOS (Darwin 24.6.0)
• Claude Code CLI