[BUG]: Atelier Iris (SLUS-21113) voices cutting out or skipping

[secondsabre]

Describe the Bug

While playing through voiced dialogue, a voiced line will randomly stop playing before the end of the line. Sometimes it will cut out completely, other times it will start rapidly skipping the last few ms of sound.

All tests and examples were run from a fresh boot, no save states involved. Please let me know if there's any further info I can provide or testing I can do to help nail this down.

Examples:

Atelier.Iris.-.Eternal.Mana.SLUS-21113.20241118124951.c.mp4

Atelier.Iris.-.Eternal.Mana.SLUS-21113.20241118125539.c.mp4

Atelier.Iris.-.Eternal.Mana.SLUS-21113.20241119122311.c.mp4

Atelier.Iris.-.Eternal.Mana.SLUS-21113.20241119132730.c.mp4

Atelier.Iris.-.Eternal.Mana.SLUS-21113.20241120120626.c.mp4

no.multithread.vmu.+.no.optimal.frame.pacing.c.mp4

Reproduction Steps

Unfortunately haven't been able to find a perfectly reproducable trigger. Will almost always happen during a sequence with 10+ voiced lines in a row, at some random point during the exchange, but not always.

Originally noticed the issue while playing a CHD archive, but also tried with a clean Redump-verified ISO and the same issue occurs.

Settings I've tried to adjust:

BIOS:
Fast Boot: same issue with off or on

Emulation:
Enable Multithreaded VU1
Optimal Frame Pacing
Vertical Sync
Enable Fast CDVD
Enable CDVD Precaching
issue remains with all of these options on or off (tried each individually as well as various combos)

Game Fixes: (just for kicks)
EE Timing Hack
DMA Busy Hack
issue remains with either of these options on or off

Graphics:
Renderer: happens on Automatic (defaults to Vulkan), Software, Vulkan, and Direct 3D 11\12

Audio:
Backend: happens on both Cubeb and SDL
Synchronization: happens on both TimeStretch and Disabled
Buffer Size and Output Latency: have increased both in steps up to 200 ms, issue remains

Regression Testing:
-Tested against oldest version of PCSX2 I have (WX Nightly v1.7.2967)
-Issue still happens with both XAudio 2 and Cubeb audio backends
-seems like it happens less frequently with XAudio 2, but issue is still there

Expected Behavior

Voiced lines should play in their entirety without skipping or cutting out.

PCSX2 Revision

v2.3.21

Operating System

Windows 10 (64bit)

If Linux - Specify Distro

No response

CPU

Ryzen 7 5700X

GPU

GeForce RTX 3070

GS Settings

Error is sound-based, so don't think that GS settings have anything to do with it (but what do I know? 🤷‍♂️)

Emulation Settings

Audio settings, which are basically default.

GS Window Screenshots

No response

Logs & Dumps

Doesn't seem to contain any relevant information, but posting it to be thorough

emulog - Copy.txt