I tested also with: "ASIO test signal generator" "ASIO latency test utility" With the last one i select 48 Khz 1024 sample 21.33ms. The program first reported that my latency is around 60ms. Now when I rerun it to check the exact value it failed with "Cannot measure the latency. Please check your connections and verify if input/output levels match". Can you test with that freeware too? If it run first then restart it and try again. Maybe I should try 48khz in Traktor with some very high latency like >50ms. Or maybe I should alter the buffers in settings menu? I have succefully ran Traktor thru Ableton Live (ASIO multihost) with older versions when traktor worked before, with latencies like 10ms maximum. I decided that the problem is in KX because I updated the driver not Traktor when it stopped working. I am not using other ASIO applications. As for traktor demo. Does it crash at start? Does it let you try the DirectSound as output or you can't even reach that menu? PS: I played a bit with the ASIO latency settings. With 128ms buffer i am able to play sound in Traktor. There are visual shuttering and UI lag, but the sound is perfect. That is at 48khz [2+2]. If I increase the buffer setting at 44khz to more than 128ms i got the same Visual shuttering and UI lag. At 44khz I can work at 10ms and even lower with any lag. I cannot try higher latencies at [8+8] or [16+16] because of "Error creating input buffer". It has to be a problem with KX. and that's only at 48khz. And maybe only with Live cards. Or nobody else is using Traktor because nobody complains. And the problem appeared after 3538 L or M version(cant recall exactly). PS2: Where can I read about the driver buffer settings? Are they related to ASIO buffers? Should I change them?