Logic Pro's QUICK SAMPLER and MULTI SAMPLER... Everything You Need to Get You Started! 

Thanks so much!

Haha, it certainly took me a few goes!

Hey, glad you enjoyed my videos. Indeed, groups can be set up with round robins. The video was getting a bit long, so I kept it brief, but it is certainly something I can explore more in other videos. There isn't a great merge across velocity layers in Logic Pro, but there is in Kontakt. You can overlap the regions in Kontakt by holding down the command key when dragging and it create a blend. I haven't seen a way to do it in Logic Pro yet (though I might not have found it).

Hey, I'm afraid I can't fit everything into a video sometimes ahaha, but hopefully I can get you on the right track with that. Essentially the source will be the "modulator" (so, an LFO, Envelope, or something external like velocity or the mod wheel) and the target is what you want to affect. For example, if you wanted to open the filter more when you hit the key louder, you could use the velocity (how hard you are hitting the keys) as the source and tie it to the Filter Cutoff (opening and closing the filter) as the target. Then the amount is how much you want to affect this by. For example, if you set it at 100%, you will see a lot of change. If you set it only at say 30%, the filter won't open as much despite how hard you are hitting it. And if you put it into the negative, like -50%, you will actually close the filter more (do the opposite) based on how hard you hit the key. Don't forget, you still need to set your source (in this case the cutoff filter) to its "starting" position. If the filter is already fully open, for example, then there is no room for the modulator to work. In your case, you are attempting to control a modulator (the LFO) with another modulator (Mod Wheel). Some samplers and synths allow this, I can't remember if logic's samplers do off the top of my head, but in that case you might tie the mod wheel as the source to the LFO's depth control. Hope this helps.

Hey, you could absolutely try it. Optimised can sometimes help, but it does sometimes get it wrong, so when that happens I tend to use the original mode and tune it to the root key myself.