Softstep toggle problem with pfft~

Hello to every one, I'm trying to interface a patch based on J.F Clarke freeze.
I'm using softstep and It's max patches. When using the step on result, that's a toggle, this toggle produce a great number of bangs.
When this bangs are sent to pfft, they make the freeze audio part functioning properly, but creates problems in viewing the spectral content..
I think this is due to the great number of bangs received, in fact if I click with the mouse on the button, everything functions properly.

I attach the patch

Someone could tell me how to solve the problem: I think that should be possible to filter out every bangs apart the first one

Thanks

Matteo Lorito