Revert the VOX preset to the NetTTS approximation
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Fisto
@@ -93,11 +93,9 @@ A short low-level leading hum (80 ms, 75 Hz, -48 dBFS) primes Discord's audio pi
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so the first word is not gated; tune with `VESKSLOP_TTS_HUM_MS` (0 = off),
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`VESKSLOP_TTS_HUM_HZ`, and `VESKSLOP_TTS_HUM_DB`.
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**Half-Life presets** (Keith Bell): `VESKSLOP_TTS_PRESET=vox` applies the Valve VOX
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profile (pitch 0, rate 15, head size 34, lowering 50) and enables VOX prosody;
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`VESKSLOP_TTS_PRESET=hev` is a starting point for the HEV suit voice. The `vox` and `hev`
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voice IDs select these directly. The VOX values were
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tuned against the game's word assets with `tools/vox_compare.py`; details in
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**Half-Life presets** (Keith Bell): `VESKSLOP_TTS_PRESET=vox` applies the approximated
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Valve VOX profile and enables VOX prosody; `VESKSLOP_TTS_PRESET=hev` is a starting point
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for the HEV suit voice. The `vox` and `hev` voice IDs select these directly. Values are in
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`docs/TTS-DESIGN.md`.
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`VESKSLOP_TTS_CRUNCH` (`hl90`, `hl90hq`, `telephone`, `adpcm`, `crush`) adds 1990s lossy
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@@ -129,14 +129,10 @@ without them.
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- VOX mode is Flextalk-only. The wrapper enables it with `VESKSLOP_TTS_VOX=1`
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(`VESKSLOP_TTS_VOX_CLEAN=1` drops the stutter wrapper); word mode
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(`VESKSLOP_TTS_WORDS=1`) wins and skips VOX prosody.
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- Half-Life presets (`VESKSLOP_TTS_PRESET=vox|hev`) target Keith Bell only. VOX starts
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from NetTTS `nettts_flextalk_vox_profile.reg` (pitch 3, rate 17, head 52, lowering 40)
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and is tuned against the game's word assets from `suchipi/half-life-vox-console`:
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shipped values are pitch 0, rate 15, prominences 22, head size 34, lowering 50,
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volume 70. Measured on 38 words vs the game assets: F0 82.3 vs 82.3 Hz, duration
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22.99 vs 23.36 s, >2 kHz share 0.0172 vs 0.0186 (old approximation: 87.5 Hz /
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22.28 s / 0.0137). `tools/vox_compare.py` reproduces the comparison. `hev`
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(pitch 15, rate 24) remains an unverified starting point - HL1 credits the suit
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- Half-Life presets (`VESKSLOP_TTS_PRESET=vox|hev`) target Keith Bell only. VOX values
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come from NetTTS `nettts_flextalk_vox_profile.reg`: pitch 3, rate 17, prominences 22,
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head size 52, volume 70 (factory: 27/33/17/46/100); `vox` also implies VOX prosody.
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`hev` (pitch 15, rate 24) is an unverified starting point - HL1 credits the suit
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sounds to Kelly Bailey with no published settings.
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- Flextalk rate/pitch are applied as **vendor tags** (`\!R` = duration factor,
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`\!%` = pitch multiplier), never `-s`/`-p`, because ITTSAttributes override the
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@@ -402,20 +402,16 @@ Kerry Watson at factory values. The wrapper implements it as a preset:
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VESKSLOP_TTS_PRESET=vox # implies VOX prosody unless VESKSLOP_TTS_VOX is set
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VESKSLOP_TTS_PRESET=hev # HEV suit starting point (see note below)
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| Profile value | Factory (Keith) | VOX preset (tuned) | HEV preset (approx.) |
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| Profile value | Factory (Keith) | VOX preset | HEV preset (approx.) |
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| --- | --- | --- | --- |
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| Pitch | 27 | 0 | 15 |
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| Speaking Rate | 33 | 15 | 24 |
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| Pitch | 27 | 3 | 15 |
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| Speaking Rate | 33 | 17 | 24 |
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| Prominences | 17 | 22 | 22 |
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| Head Size | 46 | 34 | 52 |
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| Lowering | 40 | 50 | 40 |
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| Head Size | 46 | 52 | 52 |
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| Lowering | 40 | 40 | 40 |
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| Volume | 100 | 70 | 70 |
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| Expression | 59 | 59 | 59 |
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The VOX column starts from NetTTS's approximation (pitch 3, rate 17, head 52, lowering
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40) and is refined against the actual game word assets; see
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"Tuning against the actual game assets" below.
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- Presets apply only to `keith-bell`; every other voice keeps its defaults.
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- Precedence: preset < `VESKSLOP_TTS_PROFILE` < `VESKSLOP_TTS_EXPRESSION`.
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- Equivalent explicit override:
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@@ -473,49 +469,16 @@ Verified matrix (same line, Keith Bell):
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| Run | Duration | F0 median |
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| --- | --- | --- |
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| factory, no adjustments | 3.35 s | 123 Hz |
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| VOX preset, no adjustments | 6.06 s | 82 Hz |
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| VOX preset + `speed=1.0 pitch=0` | 6.06 s, byte-identical | 82 Hz |
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| VOX preset + `speed=1.3` | 4.02 s | - |
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| VOX preset + `pitch=+3` | 6.06 s | 96 Hz |
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| VOX preset, no adjustments | 5.83 s | 87 Hz |
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| VOX preset + `speed=1.0 pitch=0` | 5.83 s, byte-identical | 87 Hz |
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| VOX preset + `speed=1.3` | 4.02 s | 84 Hz |
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| VOX preset + `pitch=+3` | 5.83 s | 88 Hz |
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| HEV preset, no adjustments | 3.79 s | - |
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Registry inspection after a preset run: 26 values in the Keith speaker key in both
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hives, `Pitch=0x0`, `Speaking Rate=0xf`, `Head Size=0x22`, `Lowering=0x32`,
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`Gender=0x2`, `Line Mode=0x1`,
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hives, `Pitch=0x3`, `Speaking Rate=0x11`, `Gender=0x2`, `Line Mode=0x1`,
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`Default Speaker={11260610-C84A-11CE-AEC4-0000C0E9CB87}`.
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#### Tuning against the actual game assets (2026-09-22)
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Reference: the word WAVs from `suchipi/half-life-vox-console`
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(`public/vox/*.wav`, Valve assets - used locally for analysis only, never committed).
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38 words at 11025 Hz 16-bit, the engine's native rate. `tools/vox_compare.py`
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reproduces the comparison; it reports the cepstrum F0 median, total audible duration,
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energy-weighted spectral centroid and the >2 kHz energy share per word set.
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| Metric (38 words) | Game assets | NetTTS approximation | Shipped VOX preset |
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| --- | --- | --- | --- |
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| F0 median | 82.3 Hz | 87.5 Hz | 82.3 Hz |
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| Duration | 23.36 s | 22.28 s | 22.99 s |
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| Spectral centroid | 515 Hz | 479 Hz | 453 Hz |
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| >2 kHz energy share | 0.0186 | 0.0137 | 0.0172 |
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Findings:
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- Registry `Pitch 0` is the engine minimum and matches the game's F0; the NetTTS
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approximation (3) was about 5 Hz high.
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- `Speaking Rate 15` matches the word durations within about 1.6%; NetTTS's 17 was
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about 4.6% fast on this corpus.
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- The game voice is brighter than the approximation. Smaller `Head Size` raises
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brightness (34 is the engine's effective minimum here; 30 gives identical output) and
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`Lowering 50` adds a little more, together closing most of the >2 kHz gap
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(0.0137 -> 0.0172 against 0.0186).
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- The residual centroid difference is mostly the reference's mid/high-band noise floor
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(game assets), not voice timbre.
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- HEV stays a starting point: no published settings and no word-level reference exists.
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Re-run recipe: write the profile to both hives, synthesize the reference word list with
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`build/sapi4host-winlib.exe -v "Keith Bell" -t <word> -o <dir>/<word>.wav`, then
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`tools/vox_compare.py <game-assets-dir> <synth-dir>`.
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### Inline rate/pitch controls (engine-side)
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The wrapper consumes NetTTS-style, line-leading controls, so Veskslop and the WebUI do
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@@ -94,8 +94,8 @@ check "vox preset implies VOX parser" "1" "$(grep -c 'wH1' "$STUB_LOG")"
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# The preset writes the full audible profile to both hives.
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VESKSLOP_TTS_VOICE=keith-bell VESKSLOP_TTS_PRESET=vox run_wrapper
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check "preset writes both hives" "2" "$(grep -c 'Speakers\\{11260610' "$STUB_REG")"
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check "preset pitch (both hives)" "2" "$(grep -c '"Pitch"=dword:00000000' "$STUB_REG")"
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check "preset rate (both hives)" "2" "$(grep -c '"Speaking Rate"=dword:0000000f' "$STUB_REG")"
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check "preset pitch (both hives)" "2" "$(grep -c '"Pitch"=dword:00000003' "$STUB_REG")"
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check "preset rate (both hives)" "2" "$(grep -c '"Speaking Rate"=dword:00000011' "$STUB_REG")"
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check "preset gender and line mode" "4" "$(grep -cE '"Gender"=dword:00000002|"Line Mode"=dword:00000001' "$STUB_REG")"
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check "preset default speaker" "2" "$(grep -c '"Default Speaker"' "$STUB_REG")"
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@@ -111,7 +111,7 @@ check "word mode with preset synthesizes every word" "3" "$(grep -c '^ARGV:' "$S
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check "word mode skips the VOX parser" "0" "$(grep -c 'wH1' "$STUB_LOG")"
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check "word mode tags every word" "3" \
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"$(sed -n 's/.*\[-t\] \[\(.*\)\] \[-o\].*/\1/p' "$STUB_LOG" | grep -c '^\\!R0.80 ')"
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check "word mode keeps the preset profile" "2" "$(grep -c '"Pitch"=dword:00000000' "$STUB_REG")"
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check "word mode keeps the preset profile" "2" "$(grep -c '"Pitch"=dword:00000003' "$STUB_REG")"
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check "word mode emits no attributes" "0" "$(attr_count)"
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# The vox preset implies VOX when the variable is unset, but word mode still wins.
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@@ -139,7 +139,7 @@ check "stream has a gap per word break" "2" \
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# The Half-Life voices carry their profile preset.
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VESKSLOP_TTS_VOICE=vox VESKSLOP_TTS_VOX=1 run_wrapper
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check "vox voice writes the VOX profile (both hives)" "2" "$(grep -c '"Pitch"=dword:00000000' "$STUB_REG")"
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check "vox voice writes the VOX profile (both hives)" "2" "$(grep -c '"Pitch"=dword:00000003' "$STUB_REG")"
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check "vox voice runs VOX prosody" "1" "$(grep -c 'wH1' "$STUB_LOG")"
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VESKSLOP_TTS_VOICE=hev run_wrapper
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check "hev voice writes the HEV profile (both hives)" "2" "$(grep -c '"Pitch"=dword:0000000f' "$STUB_REG")"
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@@ -46,7 +46,7 @@ ROOT=$MICROSLOP_ROOT
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# The Keith Bell defaults follow the active preset so the UI's "default" snap points
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# match the values the preset actually writes.
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VOX_DEFAULTS="pitch:0:rate:15:prominences:22:head_size:34:lowering:50:expression:59"
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VOX_DEFAULTS="pitch:3:rate:17:prominences:22:head_size:52:lowering:40:expression:59"
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HEV_DEFAULTS="pitch:15:rate:24:prominences:22:head_size:52:lowering:40:expression:59"
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case "${VESKSLOP_TTS_PRESET:-}" in
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vox) KB_DEFAULTS="$VOX_DEFAULTS" ;;
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@@ -243,17 +243,15 @@ if [ -n "$SPEAKER_GUID" ]; then
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P_LOWER=40
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P_EXPR=""
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# Half-Life presets for Keith Bell (the game's announcement voice). "vox"
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# starts from the approximated Valve VOX profile published by NetTTS
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# (scripts/winetricks/nettts_flextalk_vox_profile.reg), then refines pitch,
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# rate, head size and lowering against the actual game word assets
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# (see docs/TTS-DESIGN.md). "hev" is a starting point for the HEV suit
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# voice, which has no published profile.
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# Half-Life presets for Keith Bell (the game's announcement voice).
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# "vox" is the approximated Valve VOX profile published by NetTTS
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# (scripts/winetricks/nettts_flextalk_vox_profile.reg); "hev" is a starting
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# point for the HEV suit voice, which has no published profile.
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case "$PRESET" in
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vox)
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if [ "$ENGVOICE" = "Keith Bell" ]; then
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P_PITCH=0; P_RATE=15; P_VOLUME=70
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P_PROM=22; P_HEAD=34; P_LOWER=50
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P_PITCH=3; P_RATE=17; P_VOLUME=70
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P_PROM=22; P_HEAD=52; P_LOWER=40
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fi
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;;
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hev)
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