[michaelm-afk]

Expose the Audio Sync target through the existing mod option provider instead of creating another settings file or audio pipeline.

• One slider implementation for Settings → Audio and the Audio Sync mod option, 20–180 ms in 5 ms steps.
• 70 ms — Recommended; below70 Experimental (20 ms marked unstable); above70 More reserve.
• Reset to Defaults resets only the saved target to70.
• Both views re-read and write the same target_ms feature option; saved choices retain priority. The engine consumes the committed value at the next game start, with no live device retarget.
• Existing disc gating, feature visibility, disabled options and provider validation remain authoritative. No control appears without the matching provider feature/option. Other integer mod options retain their existing editor.
• Audio Diagnostics uses the same existing boolean option/provider.

Engine: RetroPortingToolKit/psxrecomp#781.
Title declaration/activation: mstan/TombaRecomp#55.
The UI itself does not call the engine API or change SPU/HQ mixing. It can build independently; the title option is required to expose the control. The Settings view is a shortcut to the same host-output-buffer option, not parallel persistence.

Validation

• Current master 3f1d6f1: complete standalone Windows Clang Release launcher build succeeds with mods enabled.
• The full paired psxrecomp runtime with this UI builds successfully.
• recomp-ui-launcher-audio-buffer-test passes bounds, 5-ms index mapping, option identity and labels.
• Real current-engine ModPackageManager round-trip passes fresh70, saved80 preservation, upper180 and reset70. Title activation verifies next-start-only consumption.
• Existing accepted personal implementation was used for the UI extraction. No new visual desktop automation or listening sweep was performed; cross-platform and visual-layout review remain appropriate.

70 ms was personally stable in tested EU1 sections on one system. Lower values can stutter/drop out; actual end-to-end speaker latency has not been measured. Source only, developed with AI assistance; no private launcher features, assets, account code or binaries.