orc = '''sr = 44100
ksmps = 32
nchnls = 1
0dbfs = 1
instr 1
idur = p3
iamp = p4
ipch = cpspch(p5)
iatk = p6
irel = p7

k1 linen iamp, iatk, idur, irel
a1 oscil k1, ipch, 1
a2 oscil k1, ipch*.997, 1
a3 oscil k1, ipch*1.004, 1
out (a1+a2+a3)*.333
endin'''

sco = 'f1 0 {0} -7 -1 {0} 1\n'.format(2**24)
start = 0

def chord(dur, amp, notes, atk, rel):
  global start, sco
  for i in range(len(notes)):
    sco += 'i1\t{:.3f}\t{:.3f}\t{:.3f}\t{:.2f}\t{:.1f}\t{:.1f}\n'.format(start, dur, amp/len(notes), notes[i], atk, rel)
  start += dur

def rest(dur):
  global start
  start += dur

chord(5, 1, [7,8,8.03,9,6,6.07], 1,4)
chord(5,.7,[6.05,7,7.05,8,8.03,8.08,9,10],.1,.4)
rest(2)
chord(15,1,[5.07,6.07,7.07,7.11,
8.02,8.09,8.11,9.02,9.07],1,3)

csd = open('chord_demo.csd','w')
csd.write(
'''<CsoundSynthesizer>
<CsOptions>
-odac -dm0 -b4096 -B4096
</CsOptions>
<CsInstruments>
{}
</CsInstruments>
<CsScore>
{}
</CsScore>
</CsoundSynthesizer>'''.format(orc, sco))