The MIDI sounds are modified by the thresholds only to a certain extent. The main purpose of the MIDI is to work as a continuous feedback to the brain. The idea of the continuous feedback is to function as a mirror that reflects everything the brain is doing. It focuses not on whether the amplitude has or hasn’t crossed the threshold, but on how much it was high or low in comparison with the target. This way, you should not expect to be able to get a yes or no response from the sounds.
There are some studies from the 90s that suggest that continuous feedback may produce a better response from the brain than contingent feedback. Brain-Trainer pioneered the use of the continuous MIDI in the late 90s. The aim of the continuous MIDI is to communicate directly with the brain and turn off any attempt of the conscious mind to figure out how the feedback is working. It works especially well for people who have a tendency to be always trying to control things. Not understanding consciously why the music is playing the way it’s playing makes the controlling mind simply let go and then the brain can respond directly to the feedback without any interference.