I'm adapting sounds I like in the Csound Catalog CD as part of
learning the language (and learning how to create interesting sounds).

I'm having trouble understanding why a modification I made to the
Anthologies->Lyon->Glnoi instrument does not result in the same sound
as the original. Specifically, the original instrument seems to pass
the note to play in Hertz, and I modified the instrument to accept the
octave/pitch notation and convert to Hertz with cpspch().  I don't
understand why the otherwise identical instruments are creating
obviously different sounds (I don't mean just the notes, but the
amplitude and other characteristics of the sound as well).

Here is the orchestra; instr 2 is the original, and instr 3 is my
modified version.

sr        =         44100
kr        =         4410
ksmps     =         10
nchnls    =         1


          instr 2
ires1     =         p4
ibf       = .05
iamp      = p5*32767 * 2.5
iseed     = p6
ibw       = p4*ibf
kenv      linseg    0,p3/2,iamp,p3/2,0
anoise    randi     1.0, 13000, iseed
ares1     reson     anoise,ires1,ibw,1
ares2     reson     ares1,ires1,ibw,1
          out       ares2*kenv
          endin

          instr 3
ires1     =         cpspch(p4)
ibf       = .05
iamp      = p5*32767 * 2.5
iseed     = p6
ibw       = p4*ibf
kenv      linseg    0,p3/2,iamp,p3/2,0
anoise    randi     1.0, 13000, iseed
ares1     reson     anoise,ires1,ibw,1
ares2     reson     ares1,ires1,ibw,1
          out       ares2*kenv
          endin

Here is the score, playing what I thought should be equivalent notes:

i2 0.0 1.7770 660.0000 0.4123 0.7022
i2 2.0 1.7770 440.0000 0.4123 0.7022
i2 4.0 1.7770 880.0000 0.4123 0.7022

i3 6.0 1.7770 8.09 0.4123 0.7022
i3 8.0 1.7770 9.04 0.4123 0.7022
i3 10.0 1.7770 9.09 0.4123 0.7022


What am I missing about why the second three notes don't sound like
the first three?


Thanks....
Toby
www.ObverseMusic.com