Inst1/2 Start modulation needs to be fixed. In order to modulate the start point, you have to enter Inst1/2 Edit mode. Unfortunately, once you enter Inst1/2 Edit mode, you break the sample's nature loop point.
The start point needs to be modulate-able without breaking the loop points - i.e. don't edit the sample just to modulate the start point.
For example, the VCO pack has carefully selected loop points. To get a good dynamic feel to simulate free running oscillator samples that beat against each other, one would need to modulate the start points (which requires you to be in Inst Edit mode to take effect (bug if you ask me)). But as soon as you do that, you get clicks because the loop points are being edited.
This has to be fixed eventually. Sooner rather than later please. I know it's on the list, but let's hope it's prioritized.
I believe this would require the start point to always be thresholded to being with the loop area (and never to exceed it). From there on, just follow the existing loop points.