This is not a review.
Acid is very cool.
Note that all of these issues came up when I created my first dinky little piece using the included loops, in perhaps two hours of use. Online documentation only. Note then that some of the following things may actually be in there, but I couldn't figure it out due to the above. Some example of things I couldn't figure out are below. But, for example, if you bring up the properties on a sample, and go to the 'stretch' page, you may notice that the 'lines' marking the transients are colored red and blue.