WinDND

Schedule Windows audio and give your microphone a physical safety switch.

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WinDND (Windows Do Not Disturb) is a lightweight tray application that controls every active Windows audio endpoint. It can mute, unmute, or set output volume on cron schedules, and it can turn a compatible two-button USB keypad into a visible microphone safety switch.

Important

USB keypad support uses the published SayoDevice O2/O2C protocol. The O2L RGB V2 with firmware 1.2.38 has been physically verified: both keys and the red/blue RGB indicators work reliably with WinDND. Complete the hardware validation checklist before relying on its indicator during a call.

Left key: microphone mute. Right key: output mute. Click the animation for the original MP4.

Scheduled audio rules	USB controller settings

Why WinDND?

• Controls all active outputs. A rule applies across speakers, monitors, docks, headsets, and newly connected endpoints.
• Protects against accidental hot microphones. The safe default mutes every active input device instead of only one application's microphone.
• Makes state visible. Compatible keypad LEDs are red only when every selected microphone is confirmed muted and blue otherwise.
• Restores rather than resets. Manual output mute remembers the previous volume of each endpoint and restores it on unmute.
• Survives real Windows behavior. Rules are reconciled after startup, resume, and audio-device changes.
• Stays local. WinDND records no audio, has no account, telemetry, or network communication, and stores settings on the current PC. See Privacy.

Quick start

1. Download the .msi from the latest release.
2. Install WinDND. It starts in the notification area and starts automatically at Windows sign-in.
3. Right-click the tray icon and choose Settings.
4. Add one or more rules, then save.

The current installer is not Authenticode-signed, so Windows may display an unknown-publisher warning. Only install packages downloaded from this repository and compare the package SHA-256 with versions-windnd.yaml in the same release.

Schedule rules

Each rule has an enabled flag, an action, and a standard five-field cron expression interpreted in the current Windows time zone.

Action	Result
mute	Mute every active audio output endpoint.
unmute	Unmute every active audio output endpoint.
0–100	Set every active output to that percentage and unmute it.

Cron fields are minute hour day-of-month month day-of-week. Useful examples:

Action	Cron	Meaning
mute	0 22 * * 1-5	Mute at 22:00, Monday through Friday.
25	30 7 * * 1-5	Set volume to 25% at 07:30 on weekdays.
unmute	0 9 * * 6,0	Unmute at 09:00 on weekends.
mute	0 12 * * *	Mute at noon every day.

Settings validates every expression and shows a human-readable explanation. If several rules occur simultaneously, the later row wins. A manual tray action remains in effect until the next reconciliation or scheduled rule.

Tray commands

• Mute all sound / Unmute / restore sound preserves endpoint volume levels across a manual mute.
• Schedule pauses or resumes rule processing; its check mark means scheduling is enabled.
• Settings opens scheduled-rule and hardware-controller configuration.
• Exit ends WinDND until it is started again or the user next signs in.

USB safe-button controller

The Hardware controller tab provides configurable support for SayoDevice O2/O2C-compatible two-key USB keypads, including the O2L RGB V2. Hardware control is disabled by default.

Default control	Behavior
Left button / F13	Toggle all active microphones.
Right button / F14	Toggle all output sound.
Both RGB indicators	Red when every selected microphone is muted; blue otherwise.

F13/F14 routing is also configurable:

Key routing	Result
WinDND only	Process the button locally and suppress normal foreground delivery. This is the default.
Foreground application only	Do not run a WinDND action; pass the original key to the focused application or RDP session.
WinDND and foreground application	Run the WinDND action and also pass the original key to the focused application or RDP session.

Button actions, indicators, RGB colors, microphone scope, key routing, USB vendor/product IDs, and automatic key programming are configurable. The initial profile targets vendor ID 8089 and product IDs 0002, 0003, and 000C.

WinDND combines Windows Raw Input with a foreground-aware keyboard hook so configured actions continue to run while an RDP client or another application has focus. Key suppression is best effort because some remote-access clients capture physical keyboard input before ordinary desktop hooks; such a client might still receive the otherwise harmless F13/F14 key even in WinDND only mode.

WinDND synchronizes both indicators with the current audio state when it starts and turns both indicators off during a graceful exit or when the hardware controller is disabled.

Complete the hardware validation checklist when testing a new keypad. RGB behavior and onboard programming are vendor-specific.

Reliability and diagnostics

Settings are stored per user in %LOCALAPPDATA%\WinDND\settings.json. Application events are written to Event Viewer → Windows Logs → Application, using source WinDND. Development runs without the installed event source fall back to %LOCALAPPDATA%\WinDND\WinDND.log.

Run these read-only checks from the installed application directory:

WinDND.exe --check-audio
WinDND.exe --check-microphone
WinDND.exe --check-monitor-lifecycle

Exit code 0 means the check succeeded; details are written to the application log. When reporting a problem, include the WinDND version, Windows version, reproduction steps, and sanitized log entries.

Requirements

• Windows 10 version 1809 or later, x64
• No separately installed .NET runtime - the MSI contains the required runtime
• A compatible USB keypad only if hardware controls are enabled

Build and test

Development requires the .NET 10 SDK. The installer restores the pinned WiX 7.0.0 SDK automatically; its project records the owner's acceptance of the WiX OSMF EULA v1.1 under EULA ID wix7.

.\build.ps1

The script restores locked dependencies, runs tests, builds the self-contained application and WiX installer, and writes the versioned MSI plus versions-windnd.yaml under artifacts\installer\x64\Release.

The application/artifact version is yy.Mdd.HHmm-g<10-character-commit>. The numeric MSI ProductVersion is (year−2000).month.minutes-elapsed-in-month, preserving Windows Installer upgrade ordering. Every successful push to main creates a GitHub release containing the MSI and its version/checksum metadata; pull requests are build-only.

See the Changelog, Contributing guide, and Security policy for more project information.

Project status

WinDND is an early public release. Near-term priorities are physical-device validation, Authenticode signing, installer reputation, and package-manager distribution. Feedback and reproducible issue reports are welcome.

License

Copyright 2026 Nuvqe. Licensed under the Apache License 2.0. See NOTICE and third-party notices for attribution details.