--- name: horizon-speech description: Check that a microphone is usable for Horizon dictation and report which layer is at fault — no signal, bad level, or a genuine model/accent limit. Use when dictation produces wrong, unrelated, or empty text. --- # Horizon speech input check This skill uses local audio diagnostics. Horizon has no speech MCP tool. Do not treat dictation as an MCP-controlled capability. Run this when a user says dictation "types the wrong thing", produces text they never said, or produces nothing. ## Read this first Whisper-family models **hallucinate fluent, plausible text when fed silence**. Given a digitally silent recording, NB-Whisper will confidently emit something like `Esther Smith, forfatter` — grammatical, idiomatic, and completely unrelated to the user. The output looks like a model, accent, or dialect problem. It is almost always a capture problem. So: **measure the capture level before touching models, languages, or config.** Never conclude "the model is bad at your accent" until step 3 shows real signal. A user cannot tell these apart from the transcript alone. That is the whole reason this skill exists. ## 1. Compare configured device against reality Horizon resolves its config by checking, in order, `$HOME/.horizon/`, then `$XDG_CONFIG_HOME/horizon/`, then a relative `horizon.yaml`/`horizon.yml` in the working directory. Resolution keys off `HOME` on every platform — **Windows included**; `USERPROFILE` is never consulted, so a native Windows launch without `HOME` set falls back to the relative path. Confirm which file is actually live before trusting it, or you may inspect a config Horizon never loaded. Read `features.speech` from that file: - `input_device: ""` means the system default input is used. - A non-empty name is matched case-insensitively: exact, then substring, then a normalized identity key. **If the configured name matches no present device, Horizon falls back to the system default and only logs a warning.** The user never sees it. A config naming a microphone that is no longer plugged in therefore looks like it works. Check the name against the live device list before anything else. List input devices: - Linux (PipeWire/PulseAudio): `wpctl status`, or `pactl list short sources` - Linux (ALSA only): `arecord -l` - macOS: `system_profiler SPAudioDataType`, or `ffmpeg -f avfoundation -list_devices true -i ""` - Windows: `ffmpeg -list_devices true -f dshow -i dummy`, or `Get-PnpDevice -Class AudioEndpoint` in PowerShell Also confirm the device is not a **Bluetooth headset in HSP/HFP mode**. That profile is narrowband and heavily compressed; it degrades accuracy badly. Prefer a wired or USB microphone, or force the A2DP-era high-quality input if the stack offers one. ## 2. Record a short sample Ask the user to speak normally for about six seconds. Record mono at 16 kHz — that is what the models consume. **Record from the device step 1 matched, never the system default.** When `input_device` names a non-default microphone, sampling the default measures a different device than Horizon uses and can yield the exact opposite diagnosis — a silent default while the real microphone works, or the reverse. - Linux (ALSA): `arecord -D -f S16_LE -r 16000 -c 1 -d 6 sample.wav`, where `` is a name from `arecord -L` - Linux (PipeWire): `pw-record --target --rate 16000 --channels 1 sample.wav` - macOS: `ffmpeg -f avfoundation -i ":" -ar 16000 -ac 1 -t 6 sample.wav` - Windows: `ffmpeg -f dshow -i audio="" -ar 16000 -ac 1 -t 6 sample.wav` Only fall back to the default device when `input_device` is empty, since that is what Horizon itself then uses. Tell the user **when recording starts**. If you launch the recorder as a background task, add a visible countdown first — otherwise the window elapses while they are still reading your message, and you will measure an empty room and misdiagnose it as a dead microphone. ## 3. Measure the level `level.py` sits next to this `SKILL.md`. Invoke it by its full path — the working directory is normally the user's workspace, not the installed skill directory, so a bare `level.py` will not be found: ``` python3 /level.py sample.wav ``` On Windows use the standard launcher: `py -3 ...\level.py sample.wav`. It needs only the Python 3 standard library, and reports peak, RMS and clipped samples, each as a percentage of full scale so the numbers mean the same thing at every sample width: | Reading | Meaning | Fix | | --- | --- | --- | | `peak` below 0.6% | No signal — capture muted, or no device | Unmute capture; confirm the right device is selected and present | | clipped samples > 20 | Too hot — distortion | Lower gain; turn microphone boost **off** first | | `rms` above 25% | Hotter than necessary | Reduce gain slightly | | `rms` 5–25% | Ideal for ASR | Nothing to do | | `rms` 2–5% | Usable | A little more gain would help | | `rms` below 2% | Too quiet | Raise gain, or move closer | ## 4. Transcribe the same file Run the profile's model against `sample.wav` and compare with what the user actually said. Horizon's models are transcribe.cpp GGUFs; if a `transcribe-cli` build is available: ``` transcribe-cli -m .gguf -l sample.wav ``` Otherwise have the user dictate the same sentence in Horizon and compare. ## 5. Verdict Combine steps 3 and 4 — this is the part the user cannot do alone: - **No signal + fluent unrelated text** → capture is dead. The text is hallucinated. Fix the microphone; the model is fine. - **Good level + empty transcript** → real audio, no speech detected. Usually room noise only, or the user did not speak inside the window. - **Clipping + roughly correct text** → working but distorted. Reduce gain; accuracy will improve, especially on consonants. - **Good level + mostly correct text with wrong proper nouns or English technical terms** → this is the model's genuine limit, not the microphone. Suggest an initial prompt to bias vocabulary, or a profile whose model suits the language better. Only at this point is accent or dialect worth discussing. Report which of these it is explicitly. "Your microphone is fine, the model mis-heard a term" and "your microphone captured nothing" are opposite fixes and look identical in the transcript. ## Adjusting gain Turn microphone **boost** off before raising capture volume — boost amplifies the microphone's own noise floor as much as the voice. - Linux (PipeWire): `wpctl set-volume <0.0-1.0>`. This maps onto the ALSA hardware control. Boost lives in `amixer -c `, e.g. `amixer -c sset 'Mic Boost' 0`. - macOS: System Settings → Sound → Input → Input volume. - Windows: Settings → System → Sound → Input → device properties. Also disable "Audio Enhancements", which can gate or suppress speech. Re-run steps 2–3 after each change. Gain that sounds fine to a human can still be clipping.