Auto scroll settings relate to the GUI. One mode for example has the playback cursor centered and the wave forms scrolling, and another mode has the playback cursor scrolling across the screen.
Not relevant to the audio questions/concerns.
I don't think I have many answers on the audio questions because I am still sorting out some oddities on a new computer myself, and after much experimenting I have dug up more questions than answers.
*Also, I should add that the similar issues I have experienced are not exclusive to VSTi but audio quality overall.
Our issues may be different and unrelated.
The difference between speakers and headphones is for me, clearly a soundcard/driver related problem. That is confirmed in my case because it is not just Mixcraft or my audio projects, but much other media, and the fact it is new to this system. And I never had that problem before migrating to this computer.
Next, if I understand correctly, we might share a problem with mix downs that change in sound from what is monitored within Mixcraft. On my previous computer, I could mix down to WAV 44.1/16 and playback in Windows Media Player (WMP) over the same monitors or headphones as used to monitor playback from Mixcraft, and I could not discern any change.
Using my new W10 computer there is a change. In experimenting, I have found that the changes vary noticeably depending on the sampling rate/bit depth I choose. Honestly I have experimented so much that I have lost perspective on the problem, and have been focusing instead on an annoyingly time consuming workaround of mixing down, listening in various players and going back and tweaking the mix and repeating. Again and again. Just to try to get some work done.
Last week I had decided the best results for me was still 44.1/16 after comparing many other format options. Playback on the same soundcard and headphones in the new Windows Groove player is noticeably less "detailed" or "defined" and the mix is subtly different from what I hear monitoring in Mixcraft. Again, new problem on new computer, never had that result before on previous computer. Therefore I don't believe it has anything directly to do with Mixcraft.
I know just enough about computers to get in trouble it seems, so its no surprise to me, I was unaware that WMP was hidden in W10 somewhere and upon discovering that I spent half of last week comparing Groove to WMP. So far, based on that I think it is not just Groove player.
Comparing in my car, or other playback situations is hard to A/B because the environment is enough different to make me uncertain. If my old computer was functional, I would be able to compare two mix downs to better narrow in on the facts.
So at this stage, I believe that this particular portion of my
problems are sampling rate conversion related, which made Cremleys comment about 48K of interest to me. But I can say with some certainty that mixing down to 48K didn't improve playback in Groove or WMP for me. I am currently experimenting with another soundcard and driver, no results to report yet.
I have a big hammer handy just in case.