update broken URLs

sox.1

@@ -4208,7 +4208,7 @@ SoX scripting examples at http://sox.sourceforge.net/Docs/Scripts
 [1]
 R. Bristow-Johnson,
 .IR "Cookbook formulae for audio EQ biquad filter coefficients" ,
-http://musicdsp.org/files/Audio-EQ-Cookbook.txt
+https://webaudio.github.io/Audio-EQ-Cookbook/audio-eq-cookbook.html
 .TP
 [2]
 Wikipedia,
@@ -4218,7 +4218,7 @@ http://en.wikipedia.org/wiki/Q_factor
 [3]
 Scott Lehman,
 .IR "Effects Explained" ,
-http://harmony-central.com/Effects/effects-explained.html
+https://web.archive.org/web/20070320114719/http://www.harmony-central.com/Effects/effects-explained.html
 .TP
 [4]
 Wikipedia,
@@ -4233,7 +4233,7 @@ http://www.ladspa.org
 [6]
 Richard Furse,
 .IR "Computer Music Toolkit" ,
-http://www.ladspa.org/cmt
+https://www.ladspa.org/cmt/overview.html
 .TP
 [7]
 Steve Harris,

soxformat.7

@@ -378,7 +378,7 @@ packed into only 4 bits, but in fact sounds no better than
 .TP
 \&\fB.lpc\fR, \fB.lpc10\fR
 LPC-10 is a compression scheme for speech developed in the United
-States. See http://www.arl.wustl.edu/~jaf/lpc/ for details. There is
+States. See https://web.archive.org/web/20090226065646/https://www.arl.wustl.edu/~jaf/lpc/ for details. There is
 no associated file format, so SoX's implementation is headerless.
 .TP
 \&\fB.mat\fR, \fB.mat4\fR, \fB.mat5\fR (optional)

src/biquads.c

@@ -16,7 +16,7 @@
  *
  *
  * 2-pole filters designed by Robert Bristow-Johnson <[email protected]>
- *   see http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
+ *   see https://webaudio.github.io/Audio-EQ-Cookbook/audio-eq-cookbook.html
  *
  * 1-pole filters based on code (c) 2000 Chris Bagwell <[email protected]>
  *   Algorithms: Recursive single pole low/high pass filter

src/gsm.c

@@ -9,10 +9,8 @@
  * GSM 06.10 courtesy Communications and Operating Systems Research Group,
  * Technische Universitaet Berlin
  *
- * More information on this format can be obtained from
- * http://www.cs.tu-berlin.de/~jutta/toasox.html
- *
- * Source is available from ftp://ftp.cs.tu-berlin.de/pub/local/kbs/tubmik/gsm
+ * Source code and more information on this format can be obtained from
+ * http://www.quut.com/gsm/
  *
  * Written 26 Jan 1995 by Andrew Pam
  * Portions Copyright (c) 1995 Serious Cybernetics

src/gsrt.c

@@ -1,6 +1,6 @@
 /* libSoX file format: Grandstream ring tone (c) 2009 [email protected]
  *
- * See http://www.grandstream.com/ringtone.html
+ * See https://web.archive.org/web/20101128121923/http://grandstream.com/ringtone.html
  *
  * This library is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as published by