I am using the Time Trainer app on my Nexus 7 (2013) Android tablet.
I find it very difficult to get the accent button to respond. It is tiny and my finger surface obscures the button and spans too much of it. When the button does respond, it sometimes increases the number of beats, and sometimes decreases the number of beats; I cannot control it.
I suggest a larger button, or perhaps two distinct, separate buttons, more widely spaced apart from each other (perhaps on either side of the numeric display).
I hope that Justin reads this post and considers this enhancement request.
Other than that difficulty, this is a dynamite app. Thank you!