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Forums     Discussions     Free Audio Plugins undocumented Features of Span

Since there isn't a users manual for Span, (at least I can't find one) what are some of the hidden features in Span that would benefit the user.  I read somewhere that you can hae the sound of a instument occupying a particular frequency by clicking on the frequency and holding control, is this correct.

Should there be a documented goodies list for the wonderful hidden features.  I need help with using this product.

Just a list of "How to -Tips and Tricks" would suffice if a manual is too much trouble.


I found this in the README file that came with SPAN:


SPAN is a real-time FFT spectrum analyzer PC VST plug-in.  For the most part it

was derived from GlissEQ and CurveEQ professional equalizers and it reproduces

their spectrum analysis functionality.


Block - specifies the block size of the FFT (Fast Fourier Transform)

spectrum analyzer.  The more the block size the more the resolution

in the lower frequency range, but less time coherence in the

higher frequency end.

Speed - specifies the speed (averaging coefficient) of the spectrum

analyzer.  The less the speed the more latent spectrum analyzer is.

This setting is effective only if the "RealT" monitoring mode is


Slope - allows you to adjust the spectrum analyzer display slope towards

higher frequencies.  This can be useful because higher frequencies

are usually weaker than lower frequencies, and thus tuning them

can be a difficult task.  By choosing an appropriate slope setting,

you can compensate for this behavior and make the spectrum plot

more convenient and meaningful.

Channel - specifies which audio channel gets analyzed. "Avg" means the

average of the L and R channels will be analyzed. "Max" means

the maximum of the L and R channels will be analyzed.

Monitor - specifies the monitoring mode. "RealT" means real-time

spectrum is displayed. "Avg" means "average of all time" is

displayed. "Max" means "maximum of all time" is displayed.

In the "Inertia" mode the previously displayed spectrum will

be displayed again in a darker color.

In the "Full" display mode the whole spectrum resolution is

used.  Other options offer graph displays of varying resolution.

Meter Mode - selects metering mode (the way RMS values represented).

Pure - standard RMS/PeakRMS value

Pure3 - standard RMS/PeakRMS value + 3 dB

K-20/K-14/K-12 - Katz metering system RMS/PeakRMS value

Low Freq/High Freq - frequency range to display.

dB Scale - specifies dB range to display.  First value is dB shift and

the second value is dB range.

Peak Hold - amount of seconds to keep peaks displayed.

You can click the analyzer surface with the left mouse button to reset

the analyzer.

By holding the CTRL key and dragging the control surface with the left

mouse button you can enable the bandpass sweeping mode.

Click any of the statistics counters to reset all counters.  Please note

that RMS counters show dB values: A/B, where B = A + 3 dB.  PRMS (peak RMS)

counter has 50 ms averaging time.

Here's a tip or trick - when remastering a track I set the Peak Hold to infinite and the Speed to 2 or 1 (very slow).  That way I can see the difference between the peaks and average across the frequency spectrum.  That helps me determin my general slope (via average curve) and overall dynamic curve across the freq spectrum.  Comparing my song against certain favorite commercial references is pretty interesting and help me contour my EQ and Dynamics accordingly.

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