I just read this thread and made notes as I was reading. Almost everything in my notes has already been suggested, but here's my list:

Run Latency Monitor or DPC Latency Checker
Switch left and right monitors
Lubricate cable ends with DeOxit
Switch out cables one by one to rule out bad cables (since you just moved and reconnected them all)
USB cable not longer than 15'
Sound settings in Windows: make sure it is 44.1 and 16 bit
Check power supply
Sample rates must match in the Windows Audio settings
New computer = new OS, new crapware?
Run Tascam in USB 2 port, not 3

Preliminary Conclusions based on progress so far:
Do the simple checks for bad connections, above, and lubricate all cable ends.
Tell us what happens in the latency checking software
128 is too low a buffer for PLAYBACK on most machines! You can use it for recording, but bump it up to 256 or 512 for playback.



BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.