Thanks! That's correct: Pedalboard just adds effects to audio, but doesn't have any notion of layers (or multiple tracks, etc). It uses the Numpy/Librosa/pysou

Thanks! That's correct: Pedalboard just adds effects to audio, but doesn't have any notion of layers (or multiple tracks, etc). It uses the Numpy/Librosa/pysoundfile convention of representing audio as floating-point Numpy arrays. Mixing two tracks together could be done pretty easily by loading the audio into memory (e.g.: with soundfile.read), adding the signals together (`track_a * 0.5 + track_b * 0.5`), then writing the result back out again. Adding silence or changing the relative timings of the tracks is a bit more complex, but not by much: the hardest part might be figuring out how long your output file needs to be, then figuring out the offsets to use in each buffer (i.e.: `output[start:end] += gain * track_a[:end - start]`).