My experiences with Sonar 8.5 and FF400 3.012 on (bootcamped) Windows 7 Ultimate 64-bit so far. This is a clean installation of Sonar 8.5 with all new files (including aud.ini):
- WDM/KS does not work (onboard Realtek works). The Wave profiler lists the currently set Samplerate as being supported, but Sonar still claims all inputs/outpus not working and suggest to turn them off (tried ignore that and play anyway, but no output).
- WASAPI works on channel 1/2 with buffer larger than than 15 ms. Wave profiler lists the currently set Samplerate as being supported by channels 1 and 8, but using any channels other than 1/2 leads to silence in Totalmix. While playing around I had one system freeze right after creating a new empty set.
- MME32 works with buffers larger than 20 ms (onboard Realtek works with smaller buffers). Any samplerate can be used and is send through Windows' mixer (SRC) like expected. Incidently the 20 ms buffer is exactly the same that is needed in Reaper for WDM to work.
- ASIO does not work most of the time. Sonar reports the ASIO device to be busy or not supporting the format. There is no connection between Sonar and the FF driver as can be seen via FF Settings Samplerate (not greyed out, does not change with Sonar's setting). *Sometimes* I managed to get ASIO working though after changing from MME to ASIO.
Both 32-bit and 64-bit seem to behave the same. A short try with Sonar 8.3 didn't reveal any differences. I'm not sure if Midi is working either, but didn't check in detail.