This probably will not help but will only take a minute to check. This COULD also MAYBE account/allow for deltas between different computers which you say you have already tried.
You say you are running multiple soundcards so you will (probably) have different DirectX sound tabs (sound1, sound 2…) when you run DXDIAG (start\run\dxdiag). Check the hardware acceleration setting in these tabs (can't hurt to look at the video and other tabs either). Set them all THE SAME I had a audio stutter on my desktop (in ONE game BIOSHOCK and in a few PTPA files using DXi etc.) took a while to find.
But setting audio accelerations to full in all tabs is what finally corrected my issue. The individual Direct X files/drivers/dlls (whatever) tested fine in diagnostics modes within DXDIAG but once everything was set the same no more issues. Don't know or care why
I've been following these threads and I really hope you get this corrected soon - good luck!
Larry
Win10Pro,i9,64GB,2TBSSD+20TBHDDs,1080TI,BIAB'24,Scarlett18i8,Montage7,Fusion 8HD,QS8,Integra7,XV5080,QSR,SC-8850,SPLAT,FL21&others,Komp.14,IK suite&others, just a guitar player-AXE FX III &FM9T, FishmanTP, MIDIGuitar2, GK2/3'sw/GI20
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