Clear any temporary files you see and the cache and see if you get sound? You didn't say whether or not you're getting error messages that it won't render, but just in case, go to the directory of the ust you're using and see if there's temporary files (.whd and another extension I can't recall as well as cache). If you have a DAW or other processes that uses audio (browser, youtube uwp, etc.), either turn them off or check their settings so that they're not using high-thread processes or are high priority in task manager (I can't make any confirmation for most daws, but I know that mixcraft's high-thread processing being turned on prevents any sound from running in other programs). Set UTAU's directory so that you (as User) have full read/write permissions, otherwise you'll have to run UTAU as administrator every time you want to use it (it's rare that this stops audio from running, but it's not unheard of) Check the aliasing of the UTAU you're using. Make sure the ust is suited to the voicebank (CV usts only work on CV banks, VCV banks work on VCV usts, etc.). If none of them make sound for any bank, then check if they're creating frq files (if you've patched the resamplers you have with nmasao's patcher, then you need to make sure the original unpatched version is in the Resampler folder and added to the engine.ini list - it often happens that they show as patched and don't actually appear in the folder).

Try every resampler publicly available from default, TIPS, tn_fnds, moresampler, etc.

If your machine was upgraded to Win10 or if the machine was originally running 8.x or 7 prior to July 29th, make sure your audio drivers are running well and are up to date.

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