just to clear things up for you (getting the correct terms..)
Those things are called plugins. AU (audio units), and VST (Virtual Studio Technology ) are two different types of plugins. (kinda like a picture can be .jpg and .gif)
certain programs can only use certain types of plugins.
other common types are: .TDM (for protools TDM) .rtas (for all protools) and directX
is there a way to get more instruments in there (ones that can be used by logic of course?)
if so how do you load them and where do you get them from.
I was just going through a tutorial and the guy loaded up the esx24, and he said that it is a sampler. you can load up samples or instruments and alter their sound based on the parameters in the esx24. (did i understand this correctly)
I also noticed this.
I saw that when he went to load different samples that he had quite a few different categories than I did and in the categories that we both had he also some different instruments.
(At the rick on being insultingly simple) maybe that something is "multi-track recording"?
The add in the ""rest of the music" you would
pen other tracks for vocals, guitar, keyboards, drums, other synths. Later they all get mixed together. You make the later tracks wile listing to the first track(s) in your headphones