Hi there,
Author of the paper here. Thanks for your question. I have actually already addressed this question on our reddit post, please see it: https://www.reddit.com/r/MachineLearning/comments/gqvnpv/p_s...
> Surfboard actually builds on LibROSA for a few of its components (e.g. MFCCs) and its functionality (e.g. loading .wav files into memory). In that sense it is the same as LibROSA for a lot of their communal functionality.
> LibROSA was built to extract individual components for music analysis. The components we built into Surfboard are largely different to those in LibROSA (apart from a few). If you are interested, please read our paper and documentation to find out more!