vlowres with iord=1 is lowres, a resonant lowpass filter derived from
a Hans Mikelson orchestra, probably "Low Pass Resonant Filter" here

http://www.csounds.com/mikelson/multifx.orc

It's the equation from lowpassr.c:

  y(n) = coef2 * (coef1 * x(n) - k * x(n-1))

with

  kfco = kfco * (1 + (sep * iord))

  b = 10 / (kres * sqrt(kfco)) - 1
  k = 1000 / kfco

  coeff1 = b+2*k
  coeff2 = 1/(1+b+k)


tito

On Sun, Nov 20, 2011 at 06:16:02AM -0800, menno wrote:
> Hi all,
> 
> On the manual page from vlowres i saw this:
> ksep -- frequency cutoff separation for each filter
> 
> i understand that you can serially connect several filters, but can someone
> explain what frequency cutoff separation does?
> 
> tia,
> Menno
> 
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