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<CsoundSynthesizer>
<CsOptions>
-odac -m0
</CsOptions>
<CsInstruments>
/*
csound-opl example 3
Control change, pitch bend, bank change and patch change with randomly selected patches
Richard Knight 2021 : examples are licensed as public domain equivalent : http://unlicense.org/
*/
sr = 44100
kr = 4410
nchnls = 2
0dbfs = 1
seed 0
; do bank changes: causes device reset which will stop current notes/possibly cause clicks but demonstrates nonetheless
gichangebank = 0
gistartbank = 0
; loop through each bank and play a note or two for each
instr main
giopl, aL, aR opl
outs aL, aR
gSbanks[] oplbanknames giopl
itime = 0
inote = 0
inotes[] fillarray 50, 52, 64, 56, 53, 59, 62
while (gistartbank < lenarray(gSbanks)) do
event_i "i", "play", itime, 2, gistartbank, inotes[inote], 0
if (inote < lenarray(inotes)-1) then
inote += 1
else
inote = 0
endif
if (random(0, 1) > 0.5) then
event_i "i", "play", itime+0.5, 0.5, gistartbank, inotes[inote], 1
endif
itime += 1
gistartbank += 1
od
p3 = itime
endin
; set the patch, play the note, optionally set the bank and call the control change instrument
instr play
ibank = p4
inote = p5
ichannel = p6
ipatch random 0, 127
if (ichannel == 0 && gichangebank = 1) then
prints sprintf("%d-%d (%s)\n", ibank, ipatch, gSbanks[ibank])
oplsetbank giopl, ibank
endif
oplpatchchange giopl, ichannel, ipatch
oplnote giopl, ichannel, inote, 100
event_i "i", "cc", p3*0.5, p3*0.5, ichannel
endin
; conditionally add a pitch bend and control change
instr cc
ichannel = p4
if (random(0, 1) > 0.6) then
ibend = (random(0, 1) > 0.5) ? 1 : -1
kbend linseg 0, p3*0.7, 0, p3*0.29, ibend, p3*0.01, 0
oplpitchbend giopl, ichannel, kbend
endif
; control change for type 1 (modulation)
if (random(0, 1) > 0.4) then
kmod linseg 0, p3*0.7, 255, p3*0.3, 0
oplcontrolchange giopl, ichannel, 1, kmod
endif
endin
</CsInstruments>
<CsScore>
i"main" 0 3600
</CsScore>
</CsoundSynthesizer>
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