First step to discharge on FAST channel
Set input parameters to scope input signal
Changed to correct DISCHARGE signal (FAST Leading to SLOW Trailing,
simple logical OR suffices, see also new Padiwa Amps firmware), and
correct DISCHARGE delay measured with scope.

Changed input to current source and matched input signal to scope
screen shots.

SLOW ToT measurements more or less works, but FAST ToT is
wrong...reason unknown... more systematic simulations need to be done!