Hi there, I'm using an interpolated delay line size for audio effects such
as flanger or vibrato. The trouble comes, when I want to change the delay
line size. So far it seems the only way is to "stretch" the entire delay
line to avoid abrupt edges that would be caused by jumping allover the
line. But this works with cubic interpolation, but not with sinc
interpolation, which generates the abrupt edges and thus zipper noise (for
obvious reasons). Any ideas how to solve this?

Thanks in advance.