I recommend the following:
1. Uninstall ASIO4ALL completely off your computer. It's presence will interfere with Roland's drivers. Do this with Sonar NOT running. You may also want a fresh boot of the computer.
2. Make sure you have latest production-released drivers for your Roland interface installed.
3. Set audio interface to: Sample Rate of either 44.1 k or 48 k, ASIO Buffer Size to 128
5. Power cycle the audio interface (if USB connected and no power switch, disconnect USB and plug back in)
5. Disable Wi-Fi-adapter
6. Start Sonar, don't go into a project yet, as you are just for now changing settings
7. Change your Driver Mode in Sonar to ASIO, and click Apply. This should now auto-populate the Record and Playback Timing Master data, and should also auto-select your Roland as the audio device in Sonar.
8. Set Sonar Sample Rate to exactly match the Sample Rate set on audio interface. Click Apply.
9. Note the Sonar-reported Total Roundtrip Latency value and post back to this thread with that info
10. Open a project and give the above a test drive in Sonar, and then post back to this thread your results and findings.
Thanks - please try ALL of the above.
I look forward to reading the results of your applying and testing the above changes. :)
Bob Bone