So assuming the AR reverb etc is the same as the A4’s, is the A4’s reverb the same as the OT?
No, unfortunately.
Well, I love the sound of the new Roland TR-8 so I’ll be making comparisons with the AR as soon as I can. I’ve programmed both the 808 and 909 and the TR-8 is a worthy successor when it comes to how it sounds, the added features (like onboard FX and external side-chaining) and how much easier it is to use. Based on how much I like making drums on the A4 I have high hopes for the AR.