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Since Csound 4.22, <emphasis>poscil</emphasis> can accept also negative frequency values and use a-rate values both for amplitude and frequency. So both AM and FM are allowed using this opcode.
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<para>The opcode <link linkend="poscil3"><citetitle>poscil3</citetitle></link> is the same as <emphasis>poscil</emphasis>, but uses cubic interpolation.</para>