I'm beginning to feel funny about posting so much in this one... (do I always do that?) ...anyway, I was going to respond to that one already, but just forgot about it.
Besides the FX1 & 2 choices, you can also make a wavetable that goes from any hard wave (square, pulse or crazier) to a very pure wave such as sine or triangle (much easier to make) and then run the Mod by MSEG1 or even just ENV1 across the table. You can even control the speed of the filter chop not just with the ENV or curve settings, but also how you spread the cells across the wavetable.
First cell a sine wave, last wave a pulse wave. Morph from first to last. Make simple MSEG curve or load "ENV Pluck easy" from the defaults. Select first cell, set Mod to full 16.00 and choose MSEG1 as modulator.
Of course, you'd want to use the FXs to get the complete sound, but that's a nice starting point. You can control the speed with MSEG1's curve, of course, but if you want extra control, you can grab for example cell 12 and duplicate it onto wave 8, then morph from 8 to 16 and from 8 to 1. This way the sound will be harder for longer. Or do the same thing inverse from wave 4 instead of 12. Anyway, you can use that opportunity to also modify the wave a bit, like shifting the pulse width. It adds more character then.
Here's a little example I made for you. I also use FX and phase for kind of a nice and full bass chop, if that's the sort of thing you mean?
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