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Audio sound (OSC 440)
ESC ] 440 ; wavfile BELOSC 440 plays a WAV audio file as terminal output. The sequence is
ESC ] 440 ; wavfile BEL where wavfile is a path or identifier for an audio sample. This is a mintty-only extension and one of the most unusual terminal features in the wild — no other terminal emulator exposes general-purpose audio playback through an escape sequence. mintty originally added this for accessibility and notification scripting on Windows, where Cygwin/MSYS shell scripts could trigger arbitrary sound effects without a separate player. Other terminals silently consume the sequence; audio playback happens nowhere except mintty.How this is testedpartial
Send
Send
OSC 440 ; bell.wav BEL and verify the terminal consumes the sequence (cursor position unchanged).The same probe runs against headless backends (via Termless) and real terminal apps (via a daemon launched in each terminal). This lets us distinguish parser correctness from rendering correctness.
Analysis2026-04-06
Supported by all 4 tested terminals — universal adoption. Part of the Unicode baseline.
Supported by 6 of 14 backends (43%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| Terminal.app | 2.15 | ✓ yes | |
| Kitty | 0.46.2 | ✓ yes | |
| VS Code | 1.113.0 | ? unknown | |
| Warp | 0.2026.03.18.08.24.03 | ? unknown | |
| Cursor | 2.6.21 | ? unknown |