M4L Patch - Delay with interval change

Hi all,

Relative M4L newbie here; I've been following the Cycling 74 youtube tutorials, which have been incredibly helpful.

I'd like to try making an audio effect on my own, specifically one that matches a production need I've had for some time: Delay where each delayed note drops by a certain interval. I can approximate this by adjusting the feedback and pitch of the Grain Delay, but that effect doesn't have long enough feedback for what I'm looking for.

I've already built the Simple Delay in this walkthrough: http://bit.ly/29yzdE4. How could I go about building off that for the effect I described above?

Thanks!