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poscil, precise oscillator (Csound opcode)

kr      pscil     kamp, kcps, ifn[, iphs]
ar      pscil     xamp, xcps, ifn[, iphs]
ifn: function table number. Requires a wrap-around guard point.
phs: Initial phase of sampling, expressed as a fraction of a cycle (0 to 1). A negative value will cause phase initialization to be skipped. The default value is 0.
See also oscil and foscili.
poscil is the same as oscili, but allows much more precise frequency control, especially when using long tables and low frequency values. It uses floating-point table indexing, instead of integer math, like oscil and oscili. It is only a bit slower than oscili