Hello friends ,..is bin a long time since the last time i was here.......
I have this problem with my hs7 xl for the longest time ,when using soft synth i get crackling noises ......off tempo ,stop responding ....and so on....
I jiust installed a new hard drive in my dell lap top is now 7400 rpm before it was lot less,i upgrated the memory  from 4 i now have 8 gig,and all i have installed on the pc is sonar and the xl package,i was doing a step recording with yhe drum kit 4 measure nothing more and im getting still after the major hardware update all this problems ....stop responding ....crackling noise ....just on a four measure single track.....why?the pc is running on 64 bit and i belive sonar is on 32 .....i think ...when i installed the hs7 did not give me the bit installation option
Thank you guys.......Tony

What driver mode are you using? Duo Capture has proper ASIO drivers written for it, I think, so that's what you shuld use. What's your latency set at?
Have you played with different buffer sizes?

The 32 bit SONAR can only use about 3 gigas of RAM, so the extra 5 gigas doesn't help in this case.

As you have used that set up successfully this far, before the hardware upgrade, I assume you have no resource eating apps running in the background.

OTOH, ASIO can only use only one interface at a time, so I wonder if Duo Capture and UM-2G cause a conflict operating simultaneously? If so, using WDM driver should/could help.

ok the audio drive is mme 32 bit
buffer is set at 20.0 msec,more than that and i will get latency...
this is a problem that i had even before the update,and there is nothing running in the background 
thank you
as far conflicting i don't think so half the time i don't even use the um 2 g,but then again .......so what you think i should do?try asio drive?

ASIO definitely, MME is the last resort.

+1 
Switch to ASIO mode. Why didn't you install 64-bit Sonar since you have a 64-bit O/S? 

Deleted duplicate post. 

Dave ......sonar did not give me that option for the 64 bit installation.....
do you think that running at 32 bit is a problem with 64 o/s?
 i will try to switch to asio drive

Make sure you download and install all the SONAR updates and patches, and the driver updates for the interface.
Use the ASIO Driver Mode for the interface.
You may have to right-click the SONAR icon and set it to 'Run As Administrator'. Do the same for the executable file on your hard drive. When right-clicking the icon, you may get an option to 'Troubleshoot Compatibility'. Click that, too, and the computer will try to select the best settings to run the older program.
Using a 32-bit program on a 64-bit machine, you're limited to 3-4 GB of memory usage, but more memory is always better, and you may want to upgrade to a 64-bit program in the future.

do you think that running at 32 bit is a problem with 64 o/s?

It shouldn't be. Keep in mind you may lose a few softsynths and effects that won't work under 64-bit. The best solution is to have both 32 and 64 bit versions installed at the same time. That way if you need one of the older DXi's, you can get to it in the 32-bit version. 

OK ...this is why when i installed beatstation from toontrack i installed on 64 bit sonar did not scaned the plug ins,i had to reinstalled on 32 ....
so you telling me that i should install the hs7  both 32 and 64 bit?