Consistent 192ms delay between parameter change and audible output in Profiler (Unreal + FMOD Studio)

Unreal Engine
1

SOLVED

Some audio assets in the same event were set to streaming.

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Setup

  • Unreal Engine 5.8.2, FMOD Studio 2.03.14

  • Windows, Audio Output: [WASAPI]

Problem

I’ve been experiencing a delay between Unreal triggering a parameter change and actually hearing the audio. In Profiler, I can see the parameter value change, and the audio waveform for the event doesn’t appear until 192ms later. Across 9 triggers in one recording, the gap was exactly 192ms every time.

The event

  • The sound is a short 2-pop, one instrument, set to play as soon as the parameter changes via trigger condition.

  • Parameter seek speed is 0, no AHDSR attack, no leading silence in the file, no instrument trigger delay or start offset, no quantisation

  • Streaming asset is off

FMOD init settings

  • DSPBuffer Length: 0, DSPBuffer Count: 0 (so FMOD defaults)

  • Studio Update Period: 0 (default)

Questions

  1. With default buffers, is ~190ms from parameter change to audio onset expected, or should I look for something in the event setup?

  2. Does the Profiler stamp the waveform at the mix point or after the DSP buffer queue? In other words, does a constant offset between parameter change and visible audio include DSP buffer latency?

Thanks!

Update #1:

Delay reduces to a consistent 182ms when reducing Buffer:

[DSP Buffer Length: 512, DSP Buffer Count: 2, Studio Update Period: 10]

Update #2

A plain Play Event reaches the speakers in 16-54ms, but the same sound triggered through Parameter Change and Trigger Condition on the instrument shows a constant ~180-190ms in the Profiler.

2

If there are any audio assets in the event that are set to streaming, every instrument in the event will be significantly delayed.