Wah Delay

Hi
Would it be possible to have an equivalent of the wah-flanger or wah-phaser etc, but to control the Delay time and/or feedback?

I play in a reggae/dub band, and love messing around with the time and feedback in the analog delay, but I have to do it by hand so far;
it creates awesome crazy fx (try setting the feedback to the max and then playing with the time knob)

Thanks