binderupsessions

I have bought a 212+ PC for live use. It is connected to my Helix rack via AES/EBU with a 100 ohm digitalcable. My problem is digital “clicks” that sounds exactly like a samplerate-issue (or clock)but ONLY from the outputs (XLR) from the PC to the FOH. (And I have tried connecting on Many systems - same problem! )There is no clicks comming from the Cab itself! The clicks comes only when using the PC onboard speaker sims(Jetson, Essex, Cream etc!!) NOT when in flat mode or when using IRs! Even when I Turn the speaker outputs Down to minus 25-30 dB - or move the virtual Mikes further away - same problem. And I have checked all possible output levels, and tried changing the sample rate, checked the AES/EBU - SPDIF. I have the latest software installed on both Helix Rack and the PC! Does anyone know this problem and how to solve it??

Before I buy a Helix Rack I would like to know: Is it possible to use two stereo-outputs at the same time: 1/4 out to a poweramp with No cab sim AND the XLR ´ s going to the PA with cab sim on? so I dont have to mikeup my guitarcabinet?!