I'm having problems with popping on playback using the Helix as my audio interface. The project is as basic as can be - one audio track, so I can't imagine I'm taxing either my computer or the Helix resourse-wise. 
  
Helix version is 2.20. 
SONAR X1 (DAW)  
Windows 7  
i5-2400 processor running at 3.10 GHz  
8 gb of Ram  
64 bit.    
  
I've played around with different USB inputs , changing the ASIO buffer setting to large, but nothing seems to work. I have 6 USB inputs , most of which are being used (HELIX, a hub to control wireless mouse and keyboard, Presonus Faderport, Yamaha MX49 keyboard, camera). I've attached a file showing the SONAR ASIO settings. Anyone encounter a similar problem or have any suggestions?