Cookbook formulae for audio EQ biquad filter coefficients

http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt

簡単なデジタルフィルタの実装 - C++でVST作り

http://vstcpp.wpblog.jp/?page_id=523

The Scientist and Engineer's Guide to Digital Signal Processing The z-Transform

http://www.analog.com/media/en/technical-documentation/dsp-book/dsp_book_Ch33.pdf

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Free FFT and convolution (JavaScript)

Copyright (c) 2017 Project Nayuki
Licensed under the MIT License
https://www.nayuki.io/page/free-small-fft-in-multiple-languages

jQuery

Copyright 2018 The jQuery Foundation
Licensed under the MIT License
https://jquery.org/

Bootstrap

Copyright 2011-2016 Twitter, Inc.
Licensed under the MIT License
https://github.com/twbs/bootstrap

dgoguerra/bootstrap-menu

Licensed under the MIT License
https://github.com/dgoguerra/bootstrap-menu