Updated snd to 16.8. 7 years of changes, big picture overview below.

Updated options to match supported ones, removing the guile one.
Many more options could be handled:
ruby, forth, alsa, oss, jack, pulseaudio, gmp, ladspa
but are not right now.

The default extension language is now s7 (a scheme), included.

Snd 16.8.

cmn: Michael Edwards got cmn to work in ECL.

s7: object->let
    changed ->byte-vector to string->byte-vector
    let-temporarily is now built-in

checked: sbcl 1.3.8|9, gtk 3.21.5

Thanks!: Michael Edwards.Snd change log

 6-Sep:     Snd 16.8.
 28-Jul:    Snd 16.7.
 14-Jun:    Snd 16.6.
 30-May:    snd-lint.scm, symbol takes any number of args.
 6-May:     Snd 16.5.
 29-Mar:    --with-webserver configuration  (Kjetil Matheussen)
 28-Mar:    Snd 16.4.
 18-Mar:    s7webserver directory (Kjetil Matheussen)
 20-Feb:    Snd 16.3.
 11-Jan-16: Snd 16.2.

2015 ----------------------------------------------------------------

 30-Nov:    Snd 16.1.
 19-Oct:    Snd 16.0.
 11-Sep:    Snd 15.9.
 1-Aug:     Snd 15.8.
 15-Jun:    Snd 15.7.
 11-May:    Snd 15.6.
 3-Apr:     Snd 15.5.
 20-Mar:    changed the no-gui repl to use repl.scm in the s7 case.
 27-Feb:    Snd 15.4.
 25-Jan:    Snd 15.3.

2015 ----------------------------------------------------------------

 18-Dec:    Snd 15.2.
 5-Nov:     moved all the motif stuff (xm.c, snd-motif.scm etc) to the *motif* environment,
              OpenGL (gl.c, snd-gl.scm) to *gl*, and gtk (xg.c, snd-gtk.scm etc) to *gtk*.
 4-Nov:     Snd 15.1.
 25-Sep:    Snd 15.0.
 17-Sep:    moved snd-x*.c to snd-motif.c
 18-Aug:    Snd 14.9.
 9-July:    Snd 14.8.
 31-May:    Snd 14.7.
 23-Apr:    Snd 14.6.
 18-Mar:    Snd 14.5.
 12-Feb:    Snd 14.4.
 4-Jan:	    Snd 14.3.

2014 ----------------------------------------------------------------

 22-Nov:    Snd 14.2.
 15-Oct:    Snd 14.1.
 11-Oct:    removed frame.scm and mixer.scm: frames and mixers are obsolete in the scheme version of Snd.
 11-Sep:    Snd 14.0.  Homogenous vectors, write readably, libc.scm, libgsl.scm.
 5-Sep:     removed kmenu.scm and oscope.scm.
 9-Aug:     write.scm, removed pretty-print.scm.
 3-Aug:     Snd 13.9.
 17-Jul:    many changes to the configure script, added tools/make-config-pc.rb.
 30-Jun:    Snd 13.8.
 11-Jun:    removed the view files dialog from the gtk version, including all the
              related extension language functions, and view-files-select-hook.
 25-May:    Snd 13.7.
 14-May:    glistener.c/h (gtk listener).
 22-Apr:    Snd 13.6.
 12-Mar:    Snd 13.5.
 4-Feb:     Snd 13.4.

2013 ----------------------------------------------------------------

 25-Dec:    Snd 13.3.
 30-Oct:    Snd 13.2.
 20-Sep:    Snd 13.1.
 8-Aug:     Snd 13.0.
 3-July:    removed ptree-channel and max-virtual-ptrees, optimization, run.c.
              (clm 5.0, sndlib 22.0).
 26-Jun:    Snd 12.12.
 4-Jun:     removed the --with-static-* configuration switches.
 21-May:    Snd 12.11.
 11-May:    all scheme-side hook code changed.  removed print-hook.
 1-May:     removed mus-audio-describe, ESD audio support, audinfo.
 12-Apr:    Snd 12.10.
 5-Mar:     Snd 12.9.
 Feb:       s7: added random-state?, hash-table-iterator?, and morally-equal?
            clm/cmn/snd/s7: removed snd1.html and snd-contents.html (these were
                 using Javascript for stuff that is now built into html), and
                 translated the rest of the html files to html5.
            snd: removed the recorder, recorder-dialog, snd-g|xrec.c,
                 changed various menu names and added a view:with-grid menu
                 moved dialog buttons around at random,
                 removed save-macros and named keyboard macros,
                 added context-sensitive tooltips to the gtk version,
                 changed the gtk listener default font to Monospace 11,
                 the "minibuffer" is now a "statusbar".  This means it is not
                    editable, so all the key sequences that used to prompt for
                    info are either undefined now, or use a dialog instead.
                 removed minibuffer-history-length, prompt-in-minibuffer, clear-minibuffer,
                    and report-in-minibuffer.  Replaced the latter two with status-report.
                 removed sound-specific search-procedures (i.e. there is only one search procedure)
                 removed the bomb function
  2-Feb:    Snd 12.8.
  27-Jan:   removed snd10.scm.

2012 ----------------------------------------------------------------

 30-Dec:    Snd 12.7.
 8-Nov:     Snd 12.6.
 29-Sep:    Snd 12.5.
 19-Aug:    Snd 12.4.
 18-Aug:    removed snd9.scm.
 14-Jul:    removed thread stuff.
 11-Jul:    Snd 12.3.
 30-May:    Snd 12.2.
 24-Apr:    Snd 12.1.
 5-Apr:     lint.scm.
 25-Mar:    show-full-range, info-popup-hook.
 21-Mar:    with-interrupts.
 18-Mar:    Snd 12.0.
 18-Mar:    removed time-graph-hook; replaced by combined-data-color.
 10-Mar:    space=play or pause, tracking-cursor stuff changed.
 4-Mar:     'src' button in Save-as dialogs to do automatic sampling rate conversion.
 1-Mar:     delete-selection-and-smooth, delete-samples-and-smooth.
 23-Feb:    sync-style variable: sync-none, sync-all, or sync-by-sound (the new default).
            Options:Controls menu item, and Edit:Unselect
	    show-selection and unselect-all.
            show-full-duration, initial-beg, initial-dur, ask-about-unsaved-edits.
            with-toolbar, with-tooltips, remember-sound-state, with-smpte-label.
	    new built-in toolbars, removed toolbar.scm and panic.scm.
            removed Snd.gtkrc, Snd.ad, and the totally obsolete X resources stuff.
            The built-in popup menus are now context sensitive, and the files popup.scm
              and gtk-popup.scm have been removed.
            with-menu-icons (Gtk only).
            play-arrow-size
 12-Feb:    Snd 11.13.
 7-Jan:     Snd 11.12.

2011 ----------------------------------------------------------------

 29-Nov:    Snd 11.11.
 5-Nov:     add|delete-watchers removed, replaced by effects-hook.
 25-Oct:    Snd 11.10.
 22-Sep:    def-clm-struct is now just a synonym for defgenerator.
 19-Sep:    removed snd7.scm and snd8.scm.
 18-Sep:    Snd 11.9.
 19-Aug:    removed the Gdk backend option; cairo is now the only choice.
 12-Aug:    Snd 11.8.
 9-Aug:     make-index.scm (replaces index.cl and indexer.scm).
 30-Jul:    removed *-button-color.
 8-July:    Snd 11.7.
 12-Jun:    removed window-property, window-property-changed-hook, send-mozilla.
            removed snd-gxutils.c.
 7-June:    Snd 11.6.
 27-May:    removed snd6.scm. added binary-io.scm.
 29-Apr:    Snd 11.5.
 7-Apr:     autoload support via s7's *unbound-variable-hook*.
 20-Mar:    Snd 11.4.
 27-Feb:    the run macro's argument no longer has to be a thunk.
 11-Feb:    Snd 11.3.
 9-Feb:     removed NLS support (the po directory and so on).
 8-Feb:     moved sound|channel|mix|mark|edit-property to C.
 23-Jan:    The rest of the Guile-dependent files have been removed.
              This includes pd-*, rt-*, and the --with-snd-as-pd-external
              --with-hobbit, and --with-rt configuration switches.
 5-Jan:     Snd 11.2.

2010 ----------------------------------------------------------------

 26-Dec:    tools/sam.c.
 21-Dec:    moved focus-follows-mouse to C as with-pointer-focus.
 	    removed def-optkey-fun and def-optkey-instrument (use define* and definstrument).
 16-Dec:    make-current-window-display (draw.scm) moved to C as with-inset-graph.
            removed Guile support.
 14-Dec:    peak-env support moved to C, added peak-env-dir, removed peak-env.*,
              peak-env-info, read-peak-env-info-file, and write-peak-env-info-file.
 11-Dec:    removed midi.c and Alsa < 1.0 support.
 7-Dec:     removed SGI support.
 4-Dec:     portaudio support.
 1-Dec:     removed --with-modules configuration switch.
 30-Nov:    Snd 11.1.
 23-Nov:    colormaps are objects now.  integer->colormap, colormap->integer.
            transforms are also objects.  integer->transform, transform->integer.
 20-Nov:    play is generic now, "old-play" is the previous form.
 6-Nov:     removed all support for gtkglext.
 2-Nov:     selection function/object. selection->mix.
 28-Oct:    pretty-print.scm.
 22-Oct:    Snd 11.0.
 16-Oct:    clm.rb and grani.rb (thanks to Mike Scholz).
 12-Oct:    generic length, srate, channels, frames, file-name, sync, maxamp.
 7-Oct:     removed run-safety; the run macro only works in s7.
 6-Oct:     removed *snd-loaded-files* and *snd-remember-paths*.
            removed tools/sed-href, tools/lines.scm, and tools/check-gtk.scm.
 29-Sep:    mixes are objects (not ints), integer->mix and mix->integer.
            all "sample-reader" and "sample_reader" names changed to "sampler".
            marks are objects (not ints), integer->mark and mark->integer.
	    regions are objects, integer->region, region->integer.
            several region functions now take the region argument first:
              insert-region, make-region-sampler, mix-region, region-sample,
              region->vct, region->frame, make-region-frame-reader.
            sounds are objects, but integers are still ok, integer->sound and sound->integer.
	    players are objects.
            removed export-all.scm, snd4.scm, snd5.scm.
 17-Sep:    Snd 10.9.
 10-Sep:    removed show-backtrace. default optimization is 6.
 9-Aug:     Snd 10.8.
 6-Jul:     Snd 10.7.
 2-Jul:     default audio in Linux is now ALSA.
 28-May:    Snd 10.6.
 17-Apr:    Snd 10.5.
 26-Feb:    Snd 10.4.
 30-Jan:    big-gens.scm (scheme-only versions of the built-in generators).
 15-Jan:    Snd 10.3.
 8-Jan:     multiprecision math support for all scheme (s7) numeric
              types and functions via gmp, mpfr, and mpc.  In configure,
              use --with-gmp.

2009 ----------------------------------------------------------------

 29-Dec:     jcvoi.scm.
 11-Dec:     snd10.scm for sum-of-sines and friends.
 28-Nov:     Snd 10.2.
 17-Nov:     removed s7-optargs.scm -- define* is now built-in in s7.
 11-Nov:     removed s7-format.scm -- format is now built-in in s7.
 4-Nov:      moved snd-run.c to run.c (for sndlib).
 29-Oct:     osc.scm thanks to Kjetil.
 16-Oct:     removed Gauche support.
 15-Oct:     Snd 10.1.
 3-Sep:      Snd 10.0.
 1-Sep:      S7 extension language.
 14-Jul:     Snd 9.11.
 7-July:     with-threaded-channels.
 30-Jun:     flatten-partials.
 27-Jun:     axis-color.
 20-Jun:     time-graph-hook.
 6-June:     with-threaded-sound (ws.scm)
 2-June:     Snd 9.10.
 30-May:     peak-phases.scm.
 20-May:     rt-various.[ch], rt-coroutines.scm, rt-stalin.scm, rt-DotEmacs, and
               many other changes thanks to Kjetil.
	     many const char* changes for g++ 4.3.0.
 17-May:     normalize-partials is now built-in.
 12-May:     expandn (clm-ins.scm) thanks to Michael Klingbeil.
 10-May:     merged green.scm into generators.scm.
 5-May:      music5 port: music5.f, music5-examples, old-music5.f

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