What the heck is that?
Once the basics are understood (I mean really well), then you will naturally tend to compound the basics into a natural ability. If forced it will be non functional under real stress and conflict, so do not push the process, let it occur.
When you repeatedly apply the basic components like actually being able to hit a target under increased and spontaneous stress and attack, then you may want to add another component to that ability. As an example say you can target the mental nerve of the chin well under fast, spontaneously and affectively, then and only then should you begin to include compounded applicational measures. This may be another target prior, depleting the "Iron Shirt" affect, or even sound.
The problem occurs for most when they try to do too much too soon and get nothing from those efforts. Sound for example will not make any difference if you do not apply it at the correct time and on target... so if you can not get to a target sound will not matter.
This is why a continuously challenging and added to methodology is critical to your approach, if you work your Kyusho in techniques or bunkai, this will help you realize this potential only if the attacker attacks you as practiced... rather impractical and give the user a false sense of security.
Doubling Kyusho attacks is one such measure that although workable in stationary application or even pre-planned and practiced technique/s, indeed will increase the affect and potential. However if you then believe you can accomplish this with sudden, aggressive and fast action or even multiple attack you are in for quite a shock. In fact any pre-planned idea will play out this exact same way.
We recommend high paced action type training with the correct tools (one of our suggested methods for compounding) as it is more easily and efficiently compounded to your achievable target easily. This will compound the affect within the same action and with sustained and ever adapting need. It will become subconscious and a true internal or internalized skill.
The key is still simplicity... as anything gets more complex, it's dependability as strength diminish... it becomes more a part of the conscious mind rather than the subconscious mind. And let's also understand that the conscious mind is a process that can accept and filter a few bit's of information at any given time, whereas the subconscious mind can filter millions of bits of information simultaneously. Just as a mother instantly picks up the distress cry of her child in a playground filled with screaming excited and distressful calls continuously... the mothers subconscious filters this out of the millions of sights, sounds, conversations, environmental and a myriad of additional occurrences and disturbances to hear and instinctively respond to that sole bit of information. It is also her subconscious that allows her to take a direct path right to the child, even through a complex barrage of other stimulus.
Kyusho is an internal art, to work it externally or consciously is a recipe for failure, then to add the extra components will not make in any better, just more complex.
-ep
