Required Materials
Alright, so here is what you're going to need:
- A PS4 tatacon.
- A small Philips screw driver (I don't know the exact size but it needs to be thin since the screws are hidden inside tiny 2~3 cm deep holes).
- A round plate of cork or cork trivet that is 16~18 cm in diameter.
- An office hole punch.
- A 1mm thick sheet of rubber. How much will vary depending on how well you conserve it but get one that is at least the size of an A4 paper just to be safe.
- Some double-sided tape.
- Scissors, knives, pens and other common tools you most likely have lying around.
All in all it's pretty cheap (less than $10) and most of it you can get from a hardware store.
Step 1: The Cork
The first thing you are going to want to do is unscrew the five screws on the back of the controller. Once they are all loose, carefully detach the front of the controller from the rear (they are connected with wires internally so you can't really pull them apart more than a few centimeters).
Next up you are going to want to detach the rubber skin by carefully pulling these little nubs on the side of it away from their slots. If you're a weakling like me this will probably hurt your fingers, so you might want to use a pair of tweezers or something similar to make it easier to grip them.
Once they are all detached you can simply remove the rubber skin to reveal a bunch of sensors, foam and plastic.
(Not pictured: the actual sensors, which are on the opposite side of the "lid". I'll show you them later.)
This pad of foam is what we want to get rid of, since it softens the blows and makes it harder for the sensors to react to light hits. Put it somewhere safe in case you ever need it again. Cork is a good alternative since it's a lot firmer while still providing some amount of cushioning (I know some players use solid wood but I've never personally tried this so I can't recommend it).
Had this been a Wii/Wii U tatacon this would have been all we have to do, but because the PS4 tatacon has the section with buttons you are going to have to trim it a little bit. Try to figure out and mark what parts you will need to cut away. It might also be smart to cut away a tiny bit of the top near where the sensor wires go to ensure they won't get damaged by the cork pushing against them.
Don't worry if you cut away slightly too much. The sensors rest on a hard and firm plastic lid so it doesn't have to be perfect.
Step 2: The Rubber
That's the quickest and easiest part done. Next up is the tiresome one. What you are going to want to do now is to patch up all the holes in the foam covering up the sensors on the sensor plate. This foam is there to prevent wear on the sensors, but it also makes it harder for the tiny little nubs on the inside of the rubber skin to make contact with the sensors. By filling in the blanks we reduce the amount of force needed for a hit on the skin to propagate to the sensors.
The cut-outs you get when you use a hole puncher are the perfect size for this. Go nuts on the rubber sheet.
These are what you want:
Then, you are going to meticulously squeeze these into the holes in the sensor foam.
Expect this to take a long time. Seriously. Put on some music or a podcast or something so you have something to entertain yourself with.
If the cut-outs are too big to squeeze them in by hand (like mine were) I suggest using a toothpick or something to make it easier to cram them in there.
I left out the outermost holes for good measure because when I modded my previous Wii U tatacon filling these in would sometimes trigger false positives on the kat sensors.
Once you are done it's going to look a bit like this:
Step 3: The Kat Sensors
Lastly, we are going to try to improve the kat sensors that run around the sides of the controller.
Still got some of that rubber sheet left over? Good. Tape one strip of double-sided tape to it and cut the taped segment into eight or ten 0.5 cm x 3 cm parts (about as long and wide as two kat sensors).
Then, simply remove the other side of the tape and stick them on the sensors in groups of two. You probably don't need to go all the way down since you will be hitting the edges on the top of the drum most of the time.
The important thing here is that the combined thickness of the rubber and tape isn't too thick as this might make the kat sensors get stuck once you reattach the drum skin (this happened to me). If the tape already has some foamy thickness of its own it might be enough to simply ignore the rubber and use only the tape.
Finally, put the rubber drum skin back, tighten it and screw everything back together. Cross your fingers, plug the controller in and hope for the best. If it doesn't work as it should some of the sensors might have gotten stuck, in which case you will have to disassemble it again and fix it.
I took mine for a spin on Mada Saitama 2000 and cleared it, which I think is a good indicator that at least something went right.
(Don't worry, the terrible score and accuracy is my own skill's fault and not the controller's).
As for how sensitive it is, my controller is sensitive enough to react to light taps using just my fingers and very rarely, if ever, fails to register hits from the drum sticks playing it normally. I basically turned my 2-stars-on-Amazon controller into 5 stars over just the course of a few hours. It's as close to an arcade experience as you can get without, well, actually going to the arcade.
Moving Forward
At this point there are lots of other small little mods that you can do. One common thing a lot of Japanese tutorials recommend is to fill the inside of the controller with smushed up balls of tissue paper to reduce the noise level of the controller. Other players pack the insides of their tatacon with clay to give it some additional weight (and also reduce the noise a bit).
One thing I suggest is to always cover up your tatacon with a towel or something equally soft to both prevent wear and make it sound less. Another thing I usually do is prop it up on a pillow, which keeps it in place and stops the sound of me hitting it from echoing throughout the desk it stands on.