Post-rendering Processing

Sometimes it can be more useful or desirable to apply processing to the entire output, instead of processing each buffer individually. This tutorial provides a basic example of how to apply processing after the transcribed buffers have been rendered.

First, we transcribe two buffers, and process them individually to apply retuning such that they conform to a pentatonic major scale. Once transcribed, we apply reverb and gain normalization to the entire rendered output, instead of doing it to each buffer.

post-rendering_processing.bell

## list of files to import
$files = (
    'trumpet.wav' 'singing.wav' 
);
## pitch class grid, in this case a pentatonic major scale
$pcgrid = 0 2 4 7 9;
## iterate through each file path in the list
for $file in $files do (
    ## import file as a buffer
    $buff = importaudio($file);
    ## apply retuning to conform to pitch class grid
    $buff = $buff.process(retune($pcgrid) );
    ## random panning value
    $pan = rand();
    ## transcribe buffer with random panning envelope
    $buff.transcribe(@pan $pan (1 - $pan)) 
);
## trigger rendering
render(
    ## auto-play after rendering
    @play 1
    ## apply post-processing
    @process (
        ## first reverb
        freeverb(@roomsize .5) 
        ## then gain normalization to -12 dB
        normalize(-12) 
    ) 
)