I'm trying to measure my Realtek sound card's WASAPI round-trip latency using Reaper, with one track for playback and the other for recording (with a loopback cable on my motherboard).
There are two general issues/questions:
1. The results, at least when using WASAPI shared, are not consistent with the results in Oblique Audio's
RTL Utility.
I already disabled the "Use audio driver reported latency". Is there something else that I need to disable, to make sure Reaper is not changing the latency?
2. Is there a way to select the "Windows Audio (Low Latency Mode)" mode that can be selected in the RTL Utility?
From a brief observation, it seems that it probably gets enabled if I keep the RTL Utility open with this mode selected before starting Reaper. Despite being low latency, it's a shared WASAPI mode, so both apps can use it. But again, the latency results differ between Reaper and the RTL Utility, so I'd like to know what's going on.