The simplest possible envelope generator for sound synthesis comprises a two-segment attack-decay shape, where the peak value is user-controllable, as is the duration of each segment. Write a program...

The simplest possible envelope generator for sound synthesis comprises a two-segment attack-decay shape, where the peak value is user-controllable, as is the duration of each segment. Write a program to generate such an AD envelope as standard breakpoints. Use two duration arguments and a single-level argument, together with an argument to set the overall number of points. Use Gnuplot to verify correctness.