I confirmed today that we were able to work around the issue by dividing the source voices sample rate by the "filter" sample rate and multiplying that result against the desired cutoff frequency. I performed some tests with a real time analyzer and found that the XACT3 filter frequency was accurate when the source sample rate was ...

Thought I would add that the Band Pass Filter frequency change is pretty obvious based on sample rate when you crank the Q factor all the way up to 30. With my same testing cross-over point of 640 Hz I see the following on my RTA: - 44 KHz sample rate @ ~630 Hz - 22 KHz sample rate @ ~1250 Hz - 11 Khz sample rate @ ~2300 Hz

I'm noticing that the filtering frequency is inconsistent based on the source sounds sample rate in XACT3 (and subsequently, XAudio2). XACT3 version is from November 2008. Project version is 2.17, Content version is 45. I have a test project set up with several mono pink noise wave/sound banks at differing sample rates like 44 KHz, 22 ...