jspline — A jitter-spline generator.
kres, ares -- Output signal
xamp -- Amplitude factor
kcpsMin, kcpsMax -- Range of point-generation rate. Min and max limits are expressed in cps.
jspline (jitter-spline generator) generates a smooth curve based on random points generated at [cpsMin, cpsMax] rate. This opcode is similar to randomi or randi or jitter, but segments are not straight lines, but cubic spline curves. Output value range is approximately > -xamp and < xamp. Actually, real range could be a bit greater, because of interpolating curves beetween each pair of random-points.
At present time generated curves are quite smooth when cpsMin is not too different from cpsMax. When cpsMin-cpsMax interval is big, some little discontinuity could occurr, but it should not be a problem, in most cases. Maybe the algorithm will be improved in next versions.
These opcodes are often better than jitter when user wants to “naturalize” or “analogize” digital sounds. They could be used also in algorithmic composition, to generate smooth random melodic lines when used together with samphold opcode.
Note that the result is quite different from the one obtained by filtering white noise, and they allow the user to obtain a much more precise control.