SWIDDER virtual 2D-slider

While GUI-setting parameters for procedures working on one or both matrix dimensions a higher reliability of correspondence between matrix dimension and sequential parameter number is appreciated. In addition, a greater slider increases its sensitivity. Both conditions are met by SWIDDER, which matches matrix dimension with its output according to ML standard. A toggle for 'dataaspectratio' is supplied.

Works in integer or float modes, is easily handled for equal positive intervals, is valid for selection of two parameters from arbitrary intervals whose upper bounds may be overridden.

Sound functions O_O and CHEER included in .zip. UNIFRND in CHEER is replaced by RAND.