Multisim Transient Analysis Stepsize Issue

Hi All,
I have a 32 second wav file that has a 1 kHz noise on it. I am trying to design a simple circuit that will remove this noise.
I am having problems with the output of the transient analysis of multisim. I have more data points that original. Here are all my steps.
Convert wav file into time domain in MATLAB with
-wavread
Save the time domain data to a txt file with matlab. This data has 1,424,800 points.
Design a notch filter with multisim. Input the data with a piecewise linear voltage source that is linked to the text file.
AC analysis of my circuit reveals that it should work, -30 dB gain at 1 kHz.
Run a transient analysis with multisim. Import the results into .tdm then into Matlab with
http://digital.ni.com/public.nsf/allkb/0EEADA99DC7D00A4862572E30037C3A2
Here is where my problem is. The output of multisim has 6,396,188 data points instead of 1,424,800. When I use wavwrite and create a new wavfile, it is 2 minutes long instead of 32 seconds like the original.
I believe my problem is the step size settings of multisim. I want to specify minimum step size but multisim does not have that option.
Any suggestions?
Thanks

Hi,
I am actually doing the same project I believe the
original poster is doing. I tried using a variety of low-pass filters
in the complete circuit and found that it did not low-pass anything.
All the filter appeared to do was to decrease the voltage of the
signal. When I used Multisim's Bode Plotter on just the low-pass filter
with a generic AC circuit, the Bode Plotter outputted the magnitude and
phase plot of what I expected the low-pass filter should have. However,
when I implemented the same low-pass filter into my circuit and
connected a Bode-Plotter, it did not output anything in the phase and
magnitude plot.
The circuit consists of (from left to right)
1) Comparator to take out a dolphin noise out of the noisy signl (the sound files are too big to attach of course)
2) Low-Pass Filter (1st order RC - while I did other higher order LPFs as well)
3) FET current-source amplifier
Both
#1 and #3 components work. It's just the low-pass filter that doesn't
for some reason in the circuit. I thought that the way I imported the
signal using Matlab's wavread command may have been incorrect. The fact
that the other two comoponents worked though makes me think otherwise.
I attached my signal .wav converter into a txt file Matlab script.
Can anyone shed light on what's going on? I am using the downloaded trial Educational version 10.1.197 of Multisim
Thanks.
Attached:
CompleteCircuit.ms10
LPFonly.ms10
saveWaveFiles.m
Attachments:
CompleteCircuit.ms10 ‏449 KB
LPF - Only.ms10 ‏108 KB

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