Hi Shunyun,
Re-read your post and missed the most obvious. Are you saying that your interface doesn't work correctly with Real Tracks, not BIAB? If so, I had the same problem with BIAB and RT. BIAB was solved by disabling network prefs, in the control panel. Real Tracks pops and crackles were solved by completely removing the Alesis driver, deleting all references to the driver, reinstalling same. Also, there is a monitoring control that I had to tweak on my IO/26. I am not familiar with the Roland unit, so not much help. I can say that I eventually did get RT to work with my iMac.

Also, I didn't say that the Mac version is flawless compared to the Windows version. My post says that so far, the Mac version is running flawlessly using RD, RT and BIAB on my iMac. The only thing I did was disable network and bluetooth settings. No crashes, no pops, no crackles.

Hope you can get your system straightened out.

Good Luck
Bill