Overlay setup is simply using two fingers per key.
For example, if you have a long right handed jack, you would normally just use one finger to start hammering away at it.
With two hands, you can "trill" on the key and combo the jack. It's effectively double setup without the extra set of inputs.
However, the problem is that you need to know your keyboard -- if you go too fast, you'll end up overpressing your keys.
We know that during the megatrill in CP, there are 8 arrows per side. In a "worst-case" scenario, we start hitting it early and it catches up to the late window. You can think of the trill as a solid pack of 2-framers, only moved up one frame at a given spot. In terms of total frames, that's 2*(4 2-framers) - 1*(1 1-framer) + 2*(4 2-framers) + 2 later windows = 17 frames of freedom to PA each side. We also know this game is 30 fps. That means 17 frames/30 fps = 0.566666667 seconds is all we've got to hit 8 notes per key, or 8 taps/(0.566666667 seconds) = 14.1176471 ~ 14 taps per second, roughly. Now, that average assumes uniform spacing, which isn't the case here. For most of the trill, you'd have to be SLIGHTLY slower than this, and for the 1-frame section, you'd have to be SLIGHTLY faster than this.
Now, most people have trouble hitting 14 taps per second per finger (you have to vibrate), but it's very hard to vibrate and control the consistency at the same time, which is why it's notoriously difficult to PA CP with a FC (this is why I only have 6 goods with a vibration FC). People who can vibrate decently can achieve higher speeds for short periods of time (for example, I've been able to hit 15-16 tps for 10 seconds on the following game):
This game requires a mouse, so keep in mind the difference between your keyboard vibration speed and mouse speed, but you can get an idea how fast you are (you can assume that your score here will be slightly better than your keyboard score). Whatever score you get, divided by 10, is your taps-per-second speed. For shorter time periods it is easier to get a higher tps because your fingers begin to fatigue as time goes on.
Regardless, 14 tps requires vibration. Overlay setup cuts this in half and only requires each finger used to hit 7 tps, which is balls easy (if you can get well over 70 tps per finger (single setup) on the previous game, you can FC CP with overlay setup). Instead of hitting the trill with two fingers, you're hitting it with four. Your left hand hits two arrows, then your right hand hits two arrows, repeat, etc, all on the same two keys.
The problem is then learning to properly trill and control your speed and consistency with two hands on the same keys, which can be difficult depending on your keyboard, because going too fast means you'll be pressing your keys way too much. You only have to go half as fast -- slow down! I've found that keyboards with flatter keys tend to work much better for overlay setup because there's less risk of overpressing (the key returns to its up state much more quickly).
So, regarding the trill, your overlay setup would play out something like this. Your hands, in conjunction, should feel like you are executing a bunch of rolls (jumptrilling IS okay since each L+R pair is only one frame apart, but I question the consistency):
Left hand hits L then R
Right hand hits L then R
Left hand hits L then R
Right hand hits L then R
Left hand hits L & R at the same time
Right hand hits L then R
Left hand hits L then R
Right hand hits L then R
PS: Trying overlay setup right now on my flat USB keyboard and I think I can get the AAA. Just got four goods and I think only one or two of them came from the megatrill.
Dossar: Can you go into the Stepmania editor and tell me the timestamp of the first arrow of a JHM jack section as well as the ending timestamp of that section and how many arrows make up that jack? I'd do it myself but Stepmania crashes my computer and literally shuts it down after it's open for about 10 seconds.
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