What does LatencyMon or DPC Checker think of your base ability for your system to handle audio streaming? (this is a reach, because you are as I understand it fine with the 32-bit version, as I understand it, but it might be nice to find out anyway). Those values should be GREAT for latency, so something else would seem to be at work here. Please review and apply one or both of the above, and post back. It's just a matter of making sure those new buffers are utilized, so not to worry either way about hurting anything. I do not know what Sonar does when it is running and sees new buffer sizes. I do not recall if you have to close and open Sonar again after changing those buffers - I would start by not cycling it, you can always cycle Sonar to be sure or if you aren't seeing the improvement. IF all is well, then you can skip trying number 2, otherwise, go ahead and also change those buffers to 512 and click Apply, and see if that helps further. See what this change does to your sound quality. So, for sure try the first change to your audio interface, then fire up Sonar and you should see your reported latency values improve, by going down some. Some folks report better audio quality at 256 - which is the new default - and some others get better quality at 512). (You can hold off on this one until after testing the above change, if you would like. In Sonar, change your Record and Playback I/O Buffers from 256 each to 512 each, then click apply. You want to try to be at or a little below 10 milliseconds for your Total Roundtrip Latency value.

Making this change will reduce the latency within Sonar, and you can see this in Preferences>Audio>Driver Settings. After making this change, power cycle the interface, to get a nice clean set of buffers and fresh memory. Adjust your audio interface ASIO Buffer Size from 256 down to 128. I think the 48 k Sample Rate is fine, and it is good you match between Sonar and your interface, as that can cause nasty things to happen if they differ. This is for a test - if it works, cool, if it does not, you can change to other settings or back to what you posted above, so not to worry.

OK - I am going to suggest you try to adjust a couple of things, from your above response with the requested info.

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