Help/Collections/Tuning.html

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  28 <p class="p1"><b>Tuning</b></p>
  29 <p class="p2"><br></p>
  30 <p class="p3"><b>Inherits from: </b><a href="../Core/Object.html"><span class="s1"><b>Object</b></span></a><b><span class="Apple-converted-space"> </span></b></p>
  31 <p class="p2"><br></p>
  32 <p class="p3">Represents a musical tuning (e.g. equal temperament, just intonation, etc.). Used in conjunction with <a href="Scale.html"><span class="s1"><b>Scale</b></span></a> to generate pitch information.</p>
  33 <p class="p4"><br></p>
  34 <p class="p5">t = <span class="s2">Tuning</span>.et12;</p>
  35 <p class="p6"><span class="s3">t.semitones;<span class="Apple-tab-span">        </span><span class="Apple-tab-span">    </span></span>// [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 ]</p>
  36 <p class="p6"><span class="s3">t.ratios;<span class="Apple-tab-span">   </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span>// [ 1, 1.0594630943591, 1.1224620483089, 1.1892071150019, etc. ]</p>
  37 <p class="p2"><br></p>
  38 <p class="p5"><span class="s2">Pbind</span>(<span class="s4">\scale</span>, <span class="s2">Scale</span>.major(t), <span class="s4">\degree</span>, <span class="s2">Pseq</span>((0..7) ++ (6..0) ++ [<span class="s4">\rest</span>], 1), <span class="s4">\dur</span>, 0.25).play;</p>
  39 <p class="p2"><br></p>
  40 <p class="p6">// use non-standard tuning</p>
  41 <p class="p5">t = <span class="s2">Tuning</span>.just;</p>
  42 <p class="p6"><span class="s3">t.semitones;<span class="Apple-tab-span">        </span><span class="Apple-tab-span">    </span></span>// [ 0, 1.1173128526978, 2.0391000173077, 3.1564128700055, etc. ]</p>
  43 <p class="p6"><span class="s3">t.ratios.collect(</span><span class="s2">_</span><span class="s3">.round(0.001));<span class="Apple-tab-span">   </span></span>// [ 1, 1.067, 1.125, 1.2, 1.25, 1.333, 1.406, 1.5, etc. ]</p>
  44 <p class="p2"><br></p>
  45 <p class="p5"><span class="s2">Pbind</span>(<span class="s4">\scale</span>, <span class="s2">Scale</span>.major(t), <span class="s4">\degree</span>, <span class="s2">Pseq</span>((0..7) ++ (6..0) ++ [<span class="s4">\rest</span>], 1), <span class="s4">\dur</span>, 0.25).play;</p>
  46 <p class="p2"><br></p>
  47 <p class="p2"><br></p>
  48 <p class="p7"><b><span class="s5">Creation</span></b></p>
  49 <p class="p2"><br></p>
  50 <p class="p3"><b>*et(pitchesPerOctave)</b></p>
  51 <p class="p4"><br></p>
  52 <p class="p3">Creates an equal-tempered scale based on <b>pitchesPerOctave</b>.</p>
  53 <p class="p4"><br></p>
  54 <p class="p3"><b>*just, *pythagorean, *werckmeister, *johnston, *partch, *wcAlpha, *bp, etc.</b></p>
  55 <p class="p4"><br></p>
  56 <p class="p3">Creates a tuning from the library stored in <b>TuningInfo</b>. For a complete list of available tunings, execute</p>
  57 <p class="p4"><br></p>
  58 <p class="p8"><span class="s6">Tuning</span>.directory</p>
  59 <p class="p4"><br></p>
  60 <p class="p3"><b>*choose(size)</b></p>
  61 <p class="p4"><br></p>
  62 <p class="p3">Creates a random tuning from the library, constrained by size (which defaults to 12).</p>
  63 <p class="p4"><br></p>
  64 <p class="p5"><span class="s2">Scale</span>.major(<span class="s2">Tuning</span>.choose).tuning.name;</p>
  65 <p class="p2"><br></p>
  66 <p class="p3"><b>*new(tuning, octaveRatio, name)</b></p>
  67 <p class="p4"><br></p>
  68 <p class="p3">Creates a <b>Tuning</b> using some or all of the parameters as follows: <b>tuning</b> can be the name of a library tuning (in which case that tuning is returned); an array of floats representing the semitone values of the tuning (in which case pitchesPerOctave will be set to the size of the array regardless of the second parameter); or nil (in which case the default tuning for <b>pitchesPerOctave</b> will be returned). <b>octaveRatio</b> defaults to 2.0, but can be set differently for stretched or compressed tunings.</p>
  69 <p class="p4"><br></p>
  70 <p class="p3">Examples:</p>
  71 <p class="p4"><br></p>
  72 <p class="p6"><span class="s2">Tuning</span><span class="s3">.new(</span><span class="s4">\et12</span><span class="s3">);<span class="Apple-tab-span">  </span></span>// standard equal temperament</p>
  73 <p class="p6">// custom tuning</p>
  74 <p class="p5"><span class="s2">Tuning</span>.new(#[ 0, 0.795, 2.251, 3.251, 4.036, 4.680, 5.915, 7.221, 8.013, 9.29, 9.930, 11.032 ]);<span class="Apple-converted-space"> </span></p>
  75 <p class="p5"><span class="s2">Tuning</span>.new((0..11).collect(<span class="s2">_</span> * (2.08 ** (1/12))), 2.08, "Stretched ET12");</p>
  76 <p class="p4"><br></p>
  77 <p class="p4"><br></p>
  78 <p class="p7"><b><span class="s5">Instance Methods</span></b></p>
  79 <p class="p4"><br></p>
  80 <p class="p3"><b>semitones</b></p>
  81 <p class="p4"><br></p>
  82 <p class="p3">Returns an array of semitone values for the pitch set. <b>as(Array)</b> is equivalent; <b>as(List)</b> returns it as a list, etc.</p>
  83 <p class="p4"><br></p>
  84 <p class="p3"><b>cents</b></p>
  85 <p class="p4"><br></p>
  86 <p class="p3">Returns a array of cent values for the pitch set.</p>
  87 <p class="p4"><br></p>
  88 <p class="p3"><b>ratios</b></p>
  89 <p class="p4"><br></p>
  90 <p class="p3">Returns a tuned array of ratios for the pitch set.</p>
  91 <p class="p4"><br></p>
  92 <p class="p4"><br></p>
  93 <p class="p7"><b><span class="s5">Examples</span></b></p>
  94 <p class="p2"><br></p>
  95 <p class="p3">For examples of use, see the <a href="Scale.html"><span class="s1"><b>Scale</b></span></a> help file.</p>
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