oscil1i — Accesses table values by incremental sampling with linear interpolation.
idel -- delay in seconds before oscil1 incremental sampling begins.
idur -- duration in seconds to sample through the oscil1 table just once. A zero or negative value will cause all initialization to be skipped.
ifn -- function table number. oscil1i requires the extended guard point.
kamp -- amplitude factor
oscil1i is an interpolating unit in which the fractional part of index is used to interpolate between adjacent table entries. The smoothness gained by interpolation is at some small cost in execution time (see also oscili, etc.), but the interpolating and non-interpolating units are otherwise interchangeable.