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21 <p class="p1"><span class="s1"><b>PV_ChainUGen<span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span></b></span><b>UGens that alter FFT chains</b></p>
22 <p class="p2"><br></p>
23 <p class="p3">"PV_ChainUGen" is an <i>abstract class</i> - in other words, a class that you do not use directly. Instead, use one of its subclasses. It represents <b>phase-vocoder</b> <a href="UGen.html"><span class="s2">UGen</span></a>s - i.e. UGens which apply some kind of transformation to the frequency-domain signal produced by <a href="FFT/FFT.html"><span class="s2">FFT</span></a>.</p>
24 <p class="p2"><br></p>
25 <p class="p3">(Strictly, this class encompasses all units whose <em>output</em> is an FFT chain. This is why FFT is in this group but IFFT is not - the IFFT unit outputs ordinary time-domain audio.)</p>
26 <p class="p2"><br></p>
27 <p class="p3">For more info on using these units, see <a href="FFT/FFT Overview.html"><span class="s2">FFT Overview</span></a>.</p>
28 <p class="p2"><br></p>
29 <p class="p3">To see all classes which derive from the PV_ChainUGen class, run this line:</p>
30 <p class="p4"><span class="s3">PV_ChainUGen</span>.allSubclasses.do(<span class="s3">_</span>.postln)</p>
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