Hi Bernt,
I’m running into a consistent issue trying to use a MOTU UltraLite mk5 for multichannel measurements in Audiolense (latest version 7.5), and I’ve narrowed it down pretty carefully but can’t seem to resolve it. I’m working with a 6-channel active setup.
If I run in simple stereo mode using MOTU ASIO for both input and output, everything behaves exactly as expected. The sweeps are clean, the impulse response looks correct, and the timing is stable and physically believable.
As soon as I switch to multichannel (6 channels) using MOTU ASIO for both input and output, I get a repetitive chirp or pulse-type artifact riding on top of the sweep. This happens even with the microphone unplugged, which makes me think the playback signal is somehow being fed back into the input stream internally. I’ve verified that loopback is disabled and all CueMix inputs are muted, so it doesn’t appear to be a straightforward routing issue.
If I instead use MOTU ASIO for playback and WASAPI for recording, the sweep itself becomes clean with no chirp, but then the timing is completely wrong. The reported delays are large, inconsistent, and not physically plausible, and they vary between runs, so it doesn’t seem to be just a fixed offset problem.
So at this point I can get either clean audio with invalid timing, or correct timing only in stereo, but not a valid multichannel measurement. Since stereo ASIO works correctly, it seems like the hardware and driver are fundamentally fine, but something about multichannel ASIO input or how Audiolense is interpreting it may be introducing an internal return path.
Have you seen this behavior with MOTU interfaces before, or is there a recommended way to ensure Audiolense only captures the actual analog input and not any internal playback signal when running multichannel?
I’m planning to move to separate devices for input and output if needed, but I wanted to check first in case there’s a proper way to make this work with a single interface.
Thanks for any insight — I feel like I’m very close but missing one piece.
Steve
