The shock to the system of going from S6 to X3 is hard to imagine. Between that and your new PC, you must be in heaven.
One thing I can suggest is that you just open up a copy of a big project, and click every menu option you can find, and right-click every object, including some buttons in the Control bar, to see what's in the context menu, and try all the tools. This will give you some idea what new features are available, and where existing features went, since pretty much everything not in the main menu will have moved, and you're going to spend a lot of time searching for things that you've comitted to muscle memory.
This applies to keyboard shortcuts, too, as many have been re-assigned. I re-bound some of the most egregious (in my eyes) examples like F7, 8, 9, 10, and their Ctrl-modified counterparts. And be sure to go through the clip and track tabs in the Inspector (I), and note the MIDI and Audio tabs at the bottom of Simple Instrument tracks (combined MIDI and audio track option for inserting soft synths). And, of course, Prochannel; so cool.
Some other miscellaneous thoughts/reminders:
B= Browser; a very powerful new feature that I don't use enough, myself); drag-drop synths, FX, and MIDI-Audio content from anywhere on your system.
D= Dock; Shift+D toggles between maximized and partial views.
1-9, 0 = Screensets 1 through 10. A very powerful feature, but take care not to inadvertently start typing numbers when you haven't opened a field for editing (!).
T= Tools; brings up the toolbar HUD (Head Up display); get used to using the Smart Tool with all the modifier keys, especially in the PRV where everything is different (right-click deletes!; double-click is Properties).
- Shift+T toggles lanes open and closed.
- Edit Filter dropdown in Tracks and Lanes (defaults to "Clips"); this is where you enable automation envelopes, Audiosnap, Inline PRV, etc.
- Right-click the record button, and note how it changes when you change modes; I think you are going to
love comp-record mode.
That's all for now; a tiny droplet in the bucket of features that is X3.
Cheers,
Dave