Kilka efektów dźwiękowych w programie Octave. Wersja w pełni kompatybilna z Matlab.   filename = 'examples/test.wav’;[Input, FS, BITS] = wavread(filename);% Butterworth filter[b, a] = butter(20, 0.2);Output = filter(b, a, Input);wavwrite(Output, FS, BITS, 'examples/out01_LP_Filter.wav’);% Double speedOutputFast = downsample(Output, 2);wavwrite(OutputFast, FS, BITS, 'examples/out02_Double_Speed.wav’);% Half speed – with zerosOutputSlow = upsample(Output, 2);wavwrite(OutputSlow, FS, BITS, 'examples/out03_Half_Speed.wav’);% Half speed -…