Cours Lua What is LuaSynth, tutoriel & guide de travaux pratiques en pdf.

Audition + LuaSynth
 Another plug-in
 VST standard
 1 plug-in can be many signal processing algorithms
 Limitation: # of Lua scripts you can write
 Engineers: Lua , signal processing not critical
 Same oscillator used through-out
 Pushes the VST to the forefront
 Focus on script authors community
What is LuaSynth
 Sound/Music processing APIs in Lua
 CLM C libs (CCRMA/Stanford package)
 Freeverb ( Jezar’s studio quality reverberation)
 STK (Open source, physical modeling)
 C Sound
 You name it!
 Lua VST GUI API
 Console App + VST Plug-in (POCs)
sample Lua plugin-script
 pitch1=param(0)*4000; pitch2=param(1)*4000
 amp = .2; dur = 8.0; maxIndex = 8; srate=44100
 ends = dur * srate
 o1 = Osc(pitch1); o2 = Osc(pitch2)
 e1 = Env({0, 1, .2, .3, 1, 0}, amp, 0, 200, ends)
 e2 = Env({0, 1, .1, .1, 1, 0}, .2, 0, 100, ends)
 c1 = Comb(.312, 1155)
 c2 = Comb(.212, 733)
 F = FreeVerb(.8, 1, 1.5, 1.0, .2, param(2))
 function processIt(nSamples)
 for i = 0, nSamples-1, 1 do
 s = env(e1) * osc(o2, maxIndex * param(3) * env(e2) * osc(o1, 0.0))
 lo,ro = freeVerb(F, s, 0, .5)
 z1 = comb(c1, lo)
 z2 = comb(c1, ro)
 output(i, z1, z2)
 end
 end
Some Numbers
 Complex algorithms in real-time
 Around 50 osc + FreVerb on a 1.8GHz PC
 Lua versus Native C implementation
 ~1.7x slower
 toLua binding only outside sample loop
 ~3-5 times slower