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<div class="rd-md"><h1>Scheme SuperCollider, a Tutorial</h1>
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<h2>Prerequisites</h2>
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<p>Scheme SuperCollider
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(<a href="http://rohandrape.net/?t=rsc3">rsc3</a>)
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requires that both the
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<a href="http://www.audiosynth.com/">SuperCollider</a>,
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synthesiser and a scheme interpreter
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(either
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<a href="https://launchpad.net/ikarus/">Ikarus</a>
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or
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<a href="https://www.scheme.com/">Chez</a>
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or
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<a href="https://www.gnu.org/software/guile/">Guile</a>)
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are all installed and working properly.</p>
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<p>The interaction environment is ordinarily
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<a href="http://www.gnu.org/software/emacs/">Emacs</a>.</p>
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<h2>Setting up Scheme SuperCollider</h2>
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<p>Scheme SuperCollider is currently only available as a set of
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<a href="http://darcs.net/">darcs</a>
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repositories, the basic system is called <code>rsc3</code> and
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requires the rhs and sosc libraries. A simple build utility is also
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required.</p>
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<pre><code>$ darcs get http://rohandrape.net/sw/mk-r6rs
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$ darcs get http://rohandrape.net/sw/rhs
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$ darcs get http://rohandrape.net/sw/sosc
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$ darcs get http://rohandrape.net/sw/rsc3
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</code></pre>
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<p>To build ensure that the <code>mk-r6rs</code> library is on the scheme library
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path and run the below in each project.</p>
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<pre><code>$ (cd mk; make prefix=~/opt)
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</code></pre>
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<p>This installs the r6rs libraries to <code>~/opt/lib/r6rs</code>.</p>
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<!--
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If using `PLT` scheme the following steps are also required:
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$ plt-r6rs --install ~/opt/lib/r6rs/rhs.sls
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$ plt-r6rs --install ~/opt/lib/r6rs/sosc.mzscheme.sls
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$ plt-r6rs --install ~/opt/lib/r6rs/rsc3.mzscheme.sls
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-->
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<h2>Setting up the Scheme SuperCollider Emacs mode</h2>
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<p>Add an appropriately modified variant of the following to <code>~/.emacs</code></p>
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<pre><code>(push "/home/rohan/sw/rsc3/emacs" load-path)
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(setq rsc3-help-directory "/home/rohan/sw/rsc3/help/")
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(setq rsc3-interpreter (list "ikarus" "/home/rohan/.rsc3"))
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(require 'rsc3)
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</code></pre>
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<p>The rsc3 emacs mode associates itself with files having the extensions
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<code>.scm</code> and <code>.lisp</code>. When the <code>rsc3</code> emacs mode is active there
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is a <code>Scheme SuperCollider</code> menu available.</p>
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<p>Ordinarily the <code>~/.rsc3</code> file will load a standard set of modules.</p>
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<pre><code>(import (rhs core)) ; rhs
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(import (sosc core)) ; sosc
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(import (rsc3 core) (rsc3 server) (rsc3 ugen)) ; rsc3
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(import (rsc3 arf) (rsc3 dot) (rsc3 lang)) ; rsc3-arf rsc3-dot rsc3-lang
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</code></pre>
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<h2>Documentation</h2>
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<p>The documentation for Scheme SuperCollider, including this tutorial,
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is written in plain text as ordinary scheme source files.</p>
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<p>Unlike ordinary programs the Scheme SuperCollider help files cannot be
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compiled to executables. Each help file contains multiple independant
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examples that can be evaluated using editor commands, either by
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selecting from the <code>Scheme SuperCollider</code> menu or using the associated
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keybinding.</p>
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<h2>Interpreter Interaction</h2>
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<p>To start the scheme interpreter use <code>C-cC-></code> (Scheme SuperCollider →
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Scheme → See scheme).</p>
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<p>Starting the interpreter splits the current window into two windows.
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If the scheme output window becomes obscured during a session you can
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see it again by typing <code>C-cC-s</code> again.</p>
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<p>To stop scheme type <code>C-cC-q</code> (Scheme SuperCollider → Scheme
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→ Quit scheme).</p>
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<h2>Starting the SuperCollider server</h2>
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<p>The SuperCollider server can be started from the command
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line. The help files assume that scsynth is listening for
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UDP connections at the standard port on the local machine.</p>
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<pre><code>$ scsynth -u 57110
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</code></pre>
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<h2>Basic SuperCollider Interaction</h2>
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<p>The SuperCollider server manages a graph of nodes with
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integer identifiers. The root node has ID zero. By
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convention ordinary graph nodes are placed in a group with
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identifier 1, however this node is not created when scsynth
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starts.</p>
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<p>To create this node we need to send an OSC message to the
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server, the expression to do this is written below. To
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evaluate an expression move the cursor to the closing
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parenthesis and type <code>C-cC-e</code> (Scheme SuperCollider →
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Expression → Evaluate).</p>
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<pre><code>(withSc3 (lambda (fd) (sendMessage fd (g_new1 1 addToTail 0))))
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</code></pre>
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<p>We can then audition a quiet sine oscillator at A440 by typing
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<code>C-cC-a</code> (Scheme SuperCollider → Expression → Play).</p>
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<pre><code>(Mul (SinOsc 440 0) 0.1)
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</code></pre>
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<p>To stop the sound we can delete the group it is a part of,
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the audition function places the synthesis node into the
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group node with ID 1, the expression below deletes that
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group.</p>
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<pre><code>(withSc3 (lambda (fd) (sendMessage fd (n_free1 1))))
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</code></pre>
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<p>In order to audition another graph we need to re-create a group with
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ID 1. rsc3 includes a function <code>reset</code> that sequences these two
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actions, first deleting the group node, then re-creating a new empty
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group.</p>
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<pre><code>(withSc3 reset)
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</code></pre>
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<p>Using this command is so common there is a keybinding for it, <code>C-cC-k</code>
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(Scheme SuperCollider → SCSynth → Reset scsynth). After a reset we
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can audition a new graph.</p>
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<pre><code>(Mul (SinOsc 220 0) 0.1)
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</code></pre>
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<p>To see the server status type <code>C-cC-p</code> (Scheme SuperCollider → SCSynth
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→ Status), which sends:</p>
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<pre><code>(withSc3 displayServerStatus)
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</code></pre>
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<p>This prints a table indicating server activity to the scheme output
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window.</p>
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<pre><code>***** SuperCollider Server Status *****
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# Ugens 0
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# Synths 0
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# Groups 2
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# Instruments 0
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% CPU (Average) 1.2261821031570435
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% CPU (Peak) 1.2635631561279297
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Sample Rate (Nominal) 44100.0
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Sample Rate (Actual) 44098.31557093504
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</code></pre>
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<h2>Multiple line expressions</h2>
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<p>Multiple line expressions are evaluated using the same mechanism as
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single line expressions, so <code>C-cC-a</code> will play the expression below:</p>
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<pre><code>(let* ((f1 (XLine 1 1000 9 removeSynth))
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(f2 (MulAdd (SinOsc f1 0) 200 800)))
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(Mul (SinOsc f2 0) 0.1))
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</code></pre>
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<h2>Help Files</h2>
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<p>To find help on a Ugen or on a SuperCollider server command place the
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cursor over the identifier and type <code>C-cC-h</code> (Scheme SuperCollider →
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Help → Scheme SuperCollider help). This opens the help file, which
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ought to have working examples in it, the above graph is in the
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<code>SinOsc</code> help file.</p>
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<p>There is also a collection of Ugen graphs,
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for instance <code>help/graph/jmcc-analog-bubbles.lisp</code>.</p>
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<h2>Monitoring incoming server messages</h2>
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<p>To monitor what OSC messages scsynth is receiving use the <code>dumpOSC</code>
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server command to request that scsynth print text traces of incoming
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messages to its standard output.</p>
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<pre><code>(withSc3 (lambda (fd) (sendMessage fd (dumpOSC 1))))
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</code></pre>
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<p>To end printing send:</p>
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<pre><code>(withSc3 (lambda (fd) (sendMessage fd (dumpOSC 0))))
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</code></pre>
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