ol = library("oscillator.lib"); fl = library("filter.lib"); //process = ol.sawtooth_demo : fl.parametric_eq_demo : // fl.mth_octave_spectral_level_demo(2) <: _,_; process = vgroup("[1]", ol.sawtooth_demo) : vgroup("[2]", fl.parametric_eq_demo) : vgroup("[3]", fl.mth_octave_spectral_level_demo(2)) <: _,_;