class AliFMDBaseDigitizer: public AliDigitizer

 Destructor

 Assignment operator

 Return:
    Reference to this object

 Initialization.   Get a pointer to the parameter manager, and
 initialize it.

 Make a pedestal.  The pedestal value is drawn from a Gaussian
 distribution.  The mean of the distribution is the measured
 pedestal, and the width is the measured noise.

 Add edep contribution from (detector,ring,sector,strip) to cache

 For the stored energy contributions in the cache (fEdep), convert
 the energy signal to ADC counts, and store the created digit in
 the digits array (AliFMD::fDigits)

 Convert the total energy deposited to a (set of) ADC count(s).

 This is done by

               Energy_Deposited      ALTRO_Channel_Size
    ADC = -------------------------- ------------------- + pedestal
          Energy_Deposition_Of_1_MIP VA1_ALICE_MIP_Range

               Energy_Deposited             fAltroChannelSize
        = --------------------------------- ----------------- + pedestal
          1.664 * Si_Thickness * Si_Density   fVA1MipRange


        = Energy_Deposited * ConversionFactor + pedestal

 However, this is modified by the response function of the
 VA1_ALICE pre-amp. chip in case we are doing oversampling of the
 VA1_ALICE output.

 In that case, we get N=fSampleRate values of the ADC, and the
 `EnergyDeposited' is a function of which sample where are
 calculating the ADC for

     ADC_i = f(EnergyDeposited, i/N, Last) * ConversionFactor + pedestal

 where Last is the Energy deposited in the previous strip.

 Here, f is the shaping function of the VA1_ALICE.   This is given
 by

                    |   (E - l) * (1 - exp(-B * t) + l   if E > l
       f(E, t, l) = <
                    |   (l - E) * exp(-B * t) + E        otherwise


                  = E + (l - E) * ext(-B * t)

 Add a digit or summable digit

 Create output tree using loader.   If the passed loader differs
 from the currently set loader in the FMD object, reset the FMD
 loader to be the passed loader.   This is for the cases wher the
 output is different from the output.

 Write the digits to disk

 The response shape of the VA1 shaping circuit is approximently
      given by
      @f[
      f(x) = A(1 - \exp(-Bx))
      @f]
      where @f$ A@f$ is the total charge collected by the pre-amp.,
      and @f$ B@f$ is parameter that depends on the shaping time of
      the @b VA1 pre-amp.  This member function sets the parameter @f$
      B@f$
@param B 

 @return Get the shaping time 

 Add noise to each sample