Kick drum (CSound instrument)

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

instr 1
  iamp      = p4

  k1  expon     120, .2, 50    
  k2  expon     500, .4, 200
  a1  oscil     iamp, k1, 1
  a2  reson     a1, k2, 50
  a3  butterlp  a2+a1,k1,1
  a4  butterlp  a3,   k1,1
  a5  butterlp  a4,2500,1
  a6  butterhp  a5,50
  a7  butterhp  a6,50
  a8  linen     a7,0.01,p3, .2  
  
  out a8
endin

f1 0   1024 10  1      

i1    .1     .4      7
i1    .5     .4      7
i1    .9     .4      7
i1   1.3     .4      7
i1   1.7     .4      7