Audio in Sequencer Plays All at Once When Using Per-Level Banks

Unreal Engine
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We recently updated our system so that each level loads its own dedicated audio bank. However, after this change, we noticed an issue with voice assets used in the Sequencer.

When the Sequencer starts playing, the voice sounds (highlighted in red in the attached screenshot) all play at once for about one second. After this initial burst, the audio then plays again at the correct timing as expected.

We have tried multiple approaches to resolve this issue, but none were successful. When we re-enabled the “Load All Banks” option in the plugin settings, the problem disappeared and the audio behaved correctly.

Because of this, it seems like there may be a bug related to using per-level banks with the Sequencer.

Could you please help us check or confirm whether this is a known issue?

Thank you.

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As a follow-up, I found additional information that may help identify the issue.

When we removed the AHDSR from the voice events, the behavior changed slightly:
during Sequencer playback, all voices briefly play for about 20ms and then stop.
This indicates that the previously observed ~1 second playback was likely caused by the AHDSR envelope.

In summary:

  • When per-level banks are used (i.e., “Load All Banks” disabled):

    • At the moment the Sequencer video starts, sounds briefly play for a very short time.

    • The duration of this brief playback depends on whether AHDSR is present.

  • When “Load All Banks” is enabled:

    • The issue does not occur, and audio plays correctly.

Based on this behavior, we believe there is a bug where, at Sequencer start time, audio events are momentarily triggered if banks are not fully loaded, and AHDSR makes this more noticeable.

Could you please check whether this is a known issue or an unintended behavior related to bank loading and Sequencer playback?