I’m thinking about the sampling, granular, and rec+looping categories, and my thoughts are generally geared toward the new(er) user. It might be convenient to have an info function like this inside the 301, as opposed to referring to the wiki or the forum as to what e.g. Dub Looper or Raw Player mean specifically (though I certainly do not want to discourage new user participation here!)
In retrospect, my input on this comes during a period of active development esp. within the categories I listed above (names of units have changed over the past few months through dialog on here), so maybe my request is unnecessary at this point, as things stabilize even more.
I understand the concern that by adding tool-tips, you would need to be consistent and add them to every unit, and you might not want to do that for something more objective like a sine.