dsh-pulse-rail

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Turn the DeepSeek Harness turn-navigation rail into a music visualiser: every thin bar grows and thickens with the system audio that is playing right now.

	A ♪ button sits right above the bottom-left user row. It opens a slider panel; every change is written back to config.json immediately — no restart.

• Windows, no admin, no drivers, no third-party runtime. System audio is captured with WASAPI shared-mode loopback by a tiny self-contained helper (lib/pulse-tap.exe, built from lib/pulse-tap.cs with the in-box .NET Framework compiler).
• Nothing but the bars change. Bar length tracks its frequency band; bar thickness follows the beat. No glow, no colour, no shadow — pure geometry, and the whole thing is a compositor-only transform: scale(), so the right edge never jitters.
• Native behaviour is untouched. Hover previews, click-to-jump and wheel scrolling of the rail keep working exactly as before; with silence the bars return pixel-for-pixel to the stock look.

Requirements

DSH	desktop / web profile (platform: web client half)
OS	Windows 10/11 x64 (WASAPI loopback)
Runtime	none — .NET Framework 4.x csc is used only to build the helper
Audio	any default render device (headphones, USB DAC, HDMI, …)

Install

A. Through the plugin manager (recommended)

1. Settings → Plugins → Add plugin and give this repository's URL (or a local path to a clone).
2. Enable it, then restart DSH (the host half is composed at boot).

The manager refuses to install while an agent is running — do it from an idle session.

B. Manual (what this plugin was developed with)

git clone https://github.com/<you>/dsh-pulse-rail.git
xcopy /E /I dsh-pulse-rail "%USERPROFILE%\.dsh\profiles\desktop\node_modules\dsh-pulse-rail"

Then add "dsh-pulse-rail" to dsh.profile.bundles in %USERPROFILE%\.dsh\profiles\desktop\package.json:

{
  "dsh": { "profile": { "bundles": [
    "@deepseek-ai/dsh-base", "@deepseek-ai/dsh-web-app", "dsh-pulse-rail"
  ] } }
}

and restart DSH. (Adding the package to dependencies as well makes it show up in the installed-plugin list and protects it from pnpm install pruning.)

Tuning

Everything lives in %USERPROFILE%\.dsh\pulse-rail\config.json. Edit it from the ♪ panel, or by hand — then apply with the bundled helper:

%USERPROFILE%\.dsh\pulse-rail\tune-config.cmd

{
  "enabled": true,      // false = stop immediately, rail returns to stock
  "minW": 0.18,         // shortest bar, in units of the native 20px bar
  "maxW": 2.6,          // longest bar (panel slider goes up to 4 = 80px)
  "minH": 2,            // thinnest bar (px) — 2 is the app's native thickness
  "maxH": 7,            // thickest bar (px) — keep <= 8, marks are 10px apart
  "gamma": 0.6,         // response curve: <1 punchier, >1 calmer
  "gate": 0.02,         // noise floor: bands below this count as silence
  "agcMix": 0.6,        // dynamic contrast: compare each band with its own slow baseline
  "atkMs": 35,          // attack / release time constants of the bars
  "relMs": 120,
  "silentMs": 450,      // how long after the last audible frame the rail resets
  "freqLayout": "center",// "top" high frequencies on top | "center" both ends low | "down" highs at the bottom
  "fps": 30,            // capture frame rate
  "tapIdleMs": 20000    // stop the capture helper after this much idle time
}

Live apply without editing files (the port is the one in DSH_WEB_URL):

Invoke-WebRequest -UseBasicParsing -Method POST -ContentType 'application/json' `
  -Body (Get-Content -Raw $env:USERPROFILE\.dsh\pulse-rail\config.json) `
  http://127.0.0.1:19387/pulse-rail/config

Want	Turn
much more dramatic	maxW → 3–4, agcMix → 0.8–1.0
calmer / less busy	agcMix → 0.3, gate → 0.05–0.1
thicker pumping	maxH → 8 (max before the bars touch)
faster reaction	atkMs → 15–25

How it works

default render device
   │  WASAPI shared-mode loopback (48 kHz, N-channel, float32)
   ▼
lib/pulse-tap.exe ── 1024-point FFT ──► 12 log-spaced bands (45 Hz – 15 kHz)
   │  one JSON line per frame on stdout, 30 fps
   ▼
host half (lib/index.js)  ──  GET /pulse-rail/state  ──►  browser half (lib/client.js)
                                    │                        │
                                    │                        └─ finds the rail, maps the 12 bands onto
                                    │                           however many marks are on screen right now
                                    └─ /pulse-rail/config, /pulse-rail/health, /pulse-rail/diag

• Host half (lib/index.js + lib/tap.js): lazily spawns the capture helper, keeps the last frame, serves it on same-origin routes. The helper is killed after 20 s without a request, is restarted with back-off if it dies, and self-terminates if the host stops heart-beating it.
• Browser half (lib/client.js): locates the rail by geometry (narrow column of small marks near the right edge, with a button[data-index] fallback), re-maps every frame to the currently rendered mark count, and writes one custom property per mark. Length and thickness are both expressed as transform: scale() on the mark's ::before, with transform-origin: 100% 50%. Because the scroll container of the rail clips horizontally at 28 px, the plugin widens that container leftwards (right edge unchanged, hit area unchanged, pointer-events passed through) so long bars are actually visible.
• Silence removes every override — the rail is byte-for-byte the app's own rendering again.

Privacy

The helper reads the system mix in memory and emits only band levels (12 floats) plus RMS/peak. No audio is recorded, buffered or written to disk. It runs only while the page asks for data and stops on its own 20 s after the last request; you can also watch it as pulse-tap.exe in Task Manager, or set "enabled": false.

Troubleshooting

GET /pulse-rail/health	helper status: running / playing / pid / restarts / last error
POST /pulse-rail/restart	restart the capture helper
GET /pulse-rail/diag	last browser-side discovery reports
%USERPROFILE%\.dsh\pulse-rail\diag.jsonl	rolling client diag log (256 KB cap)
%APPDATA%\@deepseek-ai\dsh-desktop\logs\crash-*-web-boot.log	renderer console.error lines (e.g. [dsh-pulse-rail] …)
lib\pulse-tap.exe --fps 30	run the helper by hand and watch the JSON stream

No sound in the bars? Play something and check /pulse-rail/state → playing. If running is false, look at lastError (a USB/Bluetooth endpoint that reports all-zero samples is re-initialised automatically after 5 s of silence).

Development

Tool	What it does
tools/verify-install.mjs	quickest sanity check: route registration + helper frames
tools/harness.mjs (+ page.mjs)	offline bench that replicates the rail DOM/CSS and reports every bar's measured geometry
tools/host-test.mjs	runs the real lib/index.js against a minimal webServer
tools/cdp-check.mjs	headless Edge + CDP: samples ::before transforms, right-edge alignment and hit-testing
tools/mktone.py, tools/mkmusic.py	generate test tones / pseudo-music

Rebuild the helper whenever pulse-tap.cs changes:

"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /nologo /platform:x64 /optimize+ ^
  /out:lib\pulse-tap.exe lib\pulse-tap.cs

Uninstall

1. remove "dsh-pulse-rail" from dsh.profile.bundles (and from dependencies),
2. delete node_modules\dsh-pulse-rail,
3. optionally delete %USERPROFILE%\.dsh\pulse-rail\,
4. restart DSH.

License

MIT — see LICENSE.