So far there are 2 biofeedback algorithms in the this contraption although this is by no means all that there could be.
One is a straight feedback system that simply adds the input form the sensor to a pre-set in a way which will have no overflow control. This means that with zero pre-set the output will be positively proportional to input. With a little pre-set, less force is needed to reach high power and the motor can be kept ticking over. With a good bit of pre-set then to get max output muscle action must be maintained below a threshold or there will be an overflow and the thing will stop until the muscle relaxes again. finally with a lot of pre-set then the device will be at max at rest and the more force excreted the vibrations will drop off and then ramp up with pressure.
The second will have a time delay in it so it will ramp up slowly, then once a muscle pulse larger than a pre-set value comes along it will drop off, wait and then start ramping again. This can be tweaked in a number of ways e.g. the dead time can be modified based upon the frequency of pulses received or the pre-set could vary with time, either increasing or decreasing.
Of course data can be fed back and forth to the computer which will be able to carry out more complex algorithms which opens up amazing possibilities….