Help/Libraries/JITLib/tutorials/jitlib_fading.html

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  28 <p class="p1"><br></p>
  29 <p class="p2"><b>Fade envelope generation and crossfading</b></p>
  30 <p class="p3"><br></p>
  31 <p class="p3"><br></p>
  32 <p class="p4"><span class="s1"><a href="../nodeproxy/NodeProxy.html">NodeProxy</a></span> (<a href="../nodeproxy/ProxySynthDef.html"><span class="s1">ProxySynthDef</span></a>) looks for inner envelopes in your definition function</p>
  33 <p class="p4">to find out whether <b>a fade envelope is needed or not</b>. In case there is no other inner</p>
  34 <p class="p4">possibility of freeing the synth, either<span class="Apple-converted-space"> </span></p>
  35 <p class="p3"><br></p>
  36 <p class="p4">a) <span class="Apple-tab-span">  </span>a fade envelope is created (audio / control rate output)</p>
  37 <p class="p3"><br></p>
  38 <p class="p4">b) <span class="Apple-tab-span">  </span>the synth is freed directly with no fading (scalar output or doneAction 1)</p>
  39 <p class="p3"><br></p>
  40 <p class="p4">c) <span class="Apple-tab-span">  </span>if you provide a gate arg and a doneAction 2 to your ugenGraph function, this is supposed</p>
  41 <p class="p4"><span class="Apple-tab-span">     </span>to be a fade envelope for the synth</p>
  42 <p class="p3"><br></p>
  43 <p class="p4">d) <span class="Apple-tab-span">  </span>if a synthdef name is used, case c) is supposed</p>
  44 <p class="p3"><br></p>
  45 <p class="p4">... so in most cases, there is not much to worry about, just these two points ar important,</p>
  46 <p class="p4">if one wants to use a self releasing synth or a different out ugen:</p>
  47 <p class="p3"><br></p>
  48 <p class="p4">e) <span class="Apple-tab-span">  </span>own responsibility:</p>
  49 <p class="p4"><span class="Apple-tab-span">     </span>if the function creates a ugengraph that can be freed by trigger or other things, it<span class="Apple-converted-space"> </span></p>
  50 <p class="p4"><span class="Apple-tab-span">     </span>waits for this action instead of the node proxy freeing the synth.<span class="Apple-converted-space"> </span></p>
  51 <p class="p3"><br></p>
  52 <p class="p4">f) <span class="Apple-tab-span">  </span>own out channel with 'out' arg: the control ugen with the name 'out' is set to the output channel</p>
  53 <p class="p4"><span class="Apple-tab-span">     </span>number of the proxy.</p>
  54 <p class="p5"><br></p>
  55 <p class="p6">p = <span class="s2">ProxySpace</span>.push(s.boot);</p>
  56 <p class="p5"><br></p>
  57 <p class="p6">~out.play;</p>
  58 <p class="p5"><br></p>
  59 <p class="p7">// note that you can use this functionality also when using ProxySynthDef directly:</p>
  60 <p class="p5"><br></p>
  61 <p class="p6">d = <span class="s2">ProxySynthDef</span>(<span class="s3">"test"</span>, { <span class="s2">arg</span> freq=440; <span class="s2">SinOsc</span>.ar(freq) }).send(s);</p>
  62 <p class="p6">s.sendMsg(<span class="s3">"/s_new"</span>, <span class="s3">"test"</span>, 1980, 1, 1, <span class="s4">\freq</span>, 340);</p>
  63 <p class="p6">s.sendMsg(<span class="s3">"/n_set"</span>, 1980, <span class="s4">\freq</span>, 240);</p>
  64 <p class="p6">s.sendMsg(<span class="s3">"/n_set"</span>, 1980, <span class="s4">\fadeTime</span>, 4);</p>
  65 <p class="p6">s.sendMsg(<span class="s3">"/n_set"</span>, 1980, <span class="s4">\gate</span>, 0);</p>
  66 <p class="p5"><br></p>
  67 <p class="p2"><b>a) automatic fade envelope generation</b></p>
  68 <p class="p5"><br></p>
  69 <p class="p5"><br></p>
  70 <p class="p7">// no inner envelope and audio / control rate output</p>
  71 <p class="p6">(</p>
  72 <p class="p6">~out = { <span class="s2">PinkNoise</span>.ar([1,1]*0.1) };</p>
  73 <p class="p6">)</p>
  74 <p class="p5"><br></p>
  75 <p class="p6">(</p>
  76 <p class="p6">~kout = { <span class="s2">PinkNoise</span>.kr([1,1]*0.1) };</p>
  77 <p class="p6">)</p>
  78 <p class="p5"><br></p>
  79 <p class="p2"><b>b) automatic free instead of crossfade</b></p>
  80 <p class="p5"><br></p>
  81 <p class="p7">// inner envelope that cannot free the synth, the synth is freed when a new<span class="Apple-converted-space"> </span></p>
  82 <p class="p7">// function is assigned.</p>
  83 <p class="p6">(</p>
  84 <p class="p6">~out = { <span class="s2">arg</span> t_trig; <span class="s2">EnvGen</span>.kr(<span class="s2">Env</span>.asr, t_trig) * <span class="s2">PinkNoise</span>.ar([1,1]) };</p>
  85 <p class="p6">)</p>
  86 <p class="p6">~out.group.set(<span class="s4">\t_trig</span>, 1);</p>
  87 <p class="p5"><br></p>
  88 <p class="p6">(</p>
  89 <p class="p6">~out = { <span class="s2">arg</span> t_trig; <span class="s2">EnvGen</span>.kr(<span class="s2">Env</span>.asr, t_trig) * <span class="s2">SinOsc</span>.ar([1,1]*400) };</p>
  90 <p class="p6">)</p>
  91 <p class="p6">~out.group.set(<span class="s4">\t_trig</span>, 1);</p>
  92 <p class="p5"><br></p>
  93 <p class="p5"><br></p>
  94 <p class="p7">// for a scalar output also no fade env is created, but the synth is freed (without fading)</p>
  95 <p class="p6">(</p>
  96 <p class="p6">~out = { <span class="s2">Out</span>.ar(0, <span class="s2">SinOsc</span>.ar(<span class="s2">Rand</span>(440,550),0,0.2)) };</p>
  97 <p class="p6">)</p>
  98 <p class="p5"><br></p>
  99 <p class="p5"><br></p>
 100 <p class="p2"><b>c) custom fade envelope</b></p>
 101 <p class="p5"><br></p>
 102 <p class="p7">// when a gate arg is provided, and the env can free the synth, this envelope</p>
 103 <p class="p7">// is supposed to be the fade envelope for the synth: no extra fade env is created.</p>
 104 <p class="p6">(</p>
 105 <p class="p6">~out = { <span class="s2">arg</span> gate=1; <span class="s2">EnvGen</span>.kr(<span class="s2">Env</span>.asr, gate, doneAction:2) * 0.2 * <span class="s2">SinOsc</span>.ar([1,1]*<span class="s2">Rand</span>(440,550)) };</p>
 106 <p class="p6">)</p>
 107 <p class="p5"><br></p>
 108 <p class="p2"><b>d) SynthDef name assignment</b></p>
 109 <p class="p5"><br></p>
 110 <p class="p7">// if a symbol is used as input, the defname of a def on the server is supposed</p>
 111 <p class="p7">// to represent a SynthDef that has a gate, an out input and can free itself.</p>
 112 <p class="p6">(</p>
 113 <p class="p6">~out = <span class="s4">\default</span>;</p>
 114 <p class="p6">)</p>
 115 <p class="p5"><br></p>
 116 <p class="p7">// this is the minimal requirement arguments for such a use (similar to Pbind)</p>
 117 <p class="p6">(</p>
 118 <p class="p6"><span class="s2">SynthDef</span>(<span class="s3">"test"</span>, { <span class="s2">arg</span> gate=1, out;</p>
 119 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">Out</span>.ar(out, <span class="s2">Formant</span>.ar(300, 200, 10) * <span class="s2">EnvGen</span>.kr(<span class="s2">Env</span>.asr, gate, doneAction:2))</p>
 120 <p class="p6">}).send(s);</p>
 121 <p class="p6">)</p>
 122 <p class="p5"><br></p>
 123 <p class="p7">// you can also provide a fadeTime arg, whic is set by the proxy:</p>
 124 <p class="p6">(</p>
 125 <p class="p6"><span class="s2">SynthDef</span>(<span class="s3">"test"</span>, { <span class="s2">arg</span> gate=1, out, fadeTime=1;</p>
 126 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">Out</span>.ar(out,<span class="Apple-converted-space"> </span></p>
 127 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s2">Formant</span>.ar(Rand(20,40), 600, 10, 0.2)<span class="Apple-converted-space"> </span></p>
 128 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>* <span class="s2">EnvGen</span>.kr(<span class="s2">Env</span>.asr(fadeTime,1,fadeTime), gate, doneAction:2)</p>
 129 <p class="p6"><span class="Apple-tab-span">     </span>)</p>
 130 <p class="p6">}).send(s);</p>
 131 <p class="p6">)</p>
 132 <p class="p5"><br></p>
 133 <p class="p6">~out = \test;</p>
 134 <p class="p6">~out.fadeTime = 3;</p>
 135 <p class="p5"><br></p>
 136 <p class="p4">note that the <b>number of channels</b> is your own responsibility when using symbols,<span class="Apple-converted-space"> </span></p>
 137 <p class="p4">as a symbol carries no channel information!</p>
 138 <p class="p4">(in all other cases the number of channels is wrapped or expanded to fit the proxy)</p>
 139 <p class="p5"><br></p>
 140 <p class="p7">// if the synthdef has a fixed duration envelope, there is a FAILURE /n_set Node not found message.</p>
 141 <p class="p7">// with no further significance</p>
 142 <p class="p6">(</p>
 143 <p class="p6"><span class="s2">Sy</span>n<span class="s2">thDef</span>(<span class="s3">"test"</span>, { <span class="s2">arg</span> gate=1, out;</p>
 144 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">Out</span>.ar(out,<span class="Apple-converted-space"> </span></p>
 145 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s2">Formant</span>.ar(<span class="s2">Rand</span>(20,40), 600, 10, 0.6)<span class="Apple-converted-space"> </span></p>
 146 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>* <span class="s2">EnvGen</span>.kr(<span class="s2">Env</span>.perc, gate, doneAction:2)</p>
 147 <p class="p6"><span class="Apple-tab-span">     </span>)</p>
 148 <p class="p6">}).send(s);</p>
 149 <p class="p6">)</p>
 150 <p class="p5"><br></p>
 151 <p class="p6">~out = \test;</p>
 152 <p class="p5"><br></p>
 153 <p class="p5"><br></p>
 154 <p class="p2"><b>e) own free responsibility</b></p>
 155 <p class="p5"><br></p>
 156 <p class="p5"><br></p>
 157 <p class="p7">//inner envelope that can free the synth, no extra fade env is created:</p>
 158 <p class="p6">(</p>
 159 <p class="p6">~out = { <span class="s2">arg</span> t_trig; <span class="s2">EnvGen</span>.kr(<span class="s2">Env</span>.asr, t_trig, doneAction:2) * <span class="s2">PinkNoise</span>.ar([1,1]) };</p>
 160 <p class="p6">)</p>
 161 <p class="p6">~out.group.set(<span class="s4">\t_trig</span>, 1); <span class="s5">//end it</span></p>
 162 <p class="p5"><br></p>
 163 <p class="p7"><span class="s6">~out.send; </span>//start a new synth</p>
 164 <p class="p6">~out.group.set(<span class="s4">\t_trig</span>, 1); <span class="s5">//end it again</span></p>
 165 <p class="p5"><br></p>
 166 <p class="p5"><br></p>
 167 <p class="p7">// if there is a ugen that can free the synth, no extra fade env is created either,</p>
 168 <p class="p7">// but it supposes the synth frees itself, so if a new function is assigned it does</p>
 169 <p class="p7">// not get freed.</p>
 170 <p class="p6">(</p>
 171 <p class="p6">~out = {<span class="Apple-converted-space">  </span><span class="s2">arg t_trig</span>;</p>
 172 <p class="p8"><span class="s6"><span class="Apple-tab-span">    </span></span>FreeSelf<span class="s6">.kr(</span>t_trig<span class="s6">);</span></p>
 173 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">PinkNoise</span>.ar([1,1]*0.3);</p>
 174 <p class="p6">};</p>
 175 <p class="p6">)</p>
 176 <p class="p6">~out.group.set(<span class="s4">\t_trig</span>, 1);</p>
 177 <p class="p5"><br></p>
 178 <p class="p5"><br></p>
 179 <p class="p2"><b>f) own output responsibility</b></p>
 180 <p class="p5"><br></p>
 181 <p class="p7">// the arg name 'out' can be used to output through the right channel.</p>
 182 <p class="p7">// of course with this one can get problems due to a wrong number of channels</p>
 183 <p class="p7">// or deliberate hacks.</p>
 184 <p class="p5"><br></p>
 185 <p class="p7">//left speaker</p>
 186 <p class="p6">(</p>
 187 <p class="p6">~out = { <span class="s2">arg</span> out;</p>
 188 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">OffsetOut</span>.ar(out, <span class="s2">Impulse</span>.ar(10,0,0.1))</p>
 189 <p class="p6">}</p>
 190 <p class="p6">)</p>
 191 <p class="p5"><br></p>
 192 <p class="p7">//both speakers</p>
 193 <p class="p6">(</p>
 194 <p class="p6">~out = { <span class="s2">arg</span> out;</p>
 195 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">OffsetOut</span>.ar(out, <span class="s2">Impulse</span>.ar([10, 10],0,0.1))</p>
 196 <p class="p6">}</p>
 197 <p class="p6">)</p>
 198 <p class="p5"><br></p>
 199 <p class="p7">//this plays out into another adjacent bus: this is a possible source of confusion.<span class="Apple-converted-space"> </span></p>
 200 <p class="p6">(</p>
 201 <p class="p6">~out = { <span class="s2">arg</span> out;</p>
 202 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">OffsetOut</span>.ar(out, <span class="s2">Impulse</span>.ar([10, 10, 10],0,0.1))</p>
 203 <p class="p6">}</p>
 204 <p class="p6">)</p>
 205 <p class="p5"><br></p>
 206 <p class="p5"><br></p>
 207 <p class="p5"><br></p>
 208 <p class="p5"><br></p>
 209 <p class="p5"><br></p>
 210 <p class="p5"><br></p>
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