Hi, was hoping to implement a crude emulation of the old oil-can delay effect using a digital delay line with two taps and a configurable bandpass filter feedback loop.

I was wondering if I can modulate the delay time with an LFO to simulate the 'wobbliness' of the original oil can effect or whether that's likely to introduce zipper artifacts. I guess the other question is how do i introduce wow into a signal (i.e. a time-varying playback-speed effect). I mean it's easy with an oscillator- just add LFO FM but how do you do it in a delay?

Suggestions anyone? I'd love to have something like this to play with.