Last time (incase that edit didn't come visible due to c9 caching):
This isn't about reaction but action to known (or highly probable/predictable) information! Computer I-O lag is all that matters in this scenario!
Only if your action was poorly timed, the information flow changes so much that you have to react to it (like the faster you drive or the tempo is, the less time you have to anticipate and time your action to the changed pattern / error in the position in the environment).
This guy would know what I'm talking (were he to try use midi drums in ninjam) about were he still alive.