50hz/60hz sync is important. I use a 50hz monitor. when using a different graphics card this problem appears, sometimes I can make it go away. I believe it is a configuration issue that can be resolved, there is a new -0.2Hz option for experimenting. this audio glitch does not affect the actual output, single channel is fine only the effect "preview" for stereo, quad and multi mode with all 4 channels (caps lock) has a cycling noise "sometimes" depending on a few factors, an artifact of emulation maybe. It is only a preview of the effect, and doesn't affect recording or network output, it is not in the "data" but something in the "timing". the -0.2Hz option has some positive effect on the buffer underrun issue (see wiki) as well, but the results are not consistent.