While doing a loopback test, I noticed that the beginning of the first input block contains what looks like the last 64 samples of the previous stream - basically the remnants of the last stream appear to be leaking into the next stream.

This happens even if the previous stream ended gracefully, and despite the fact that ASIO401 follows the QA401 reset procedure after a stream ends and before the next one starts.

I did not yet check if it's the output side or the input side that's at fault here.