| Do you mean a filter that sweeps automatically? If you want it to sweep based on your playing dynamics, you'll want an envelope filter, if you want it to sweep to a predetermined tempo, you'll need a pedal with some sort of LFO and tap tempo (or MIDI clock input).
If you want a low-pass that is just static/non-moving, then you can either set a wah in one position (though wahs are usually bandpass filters, there are some that can be used as low-pass) or you can get a static filter like an Iron Ether Xerograph or a few others that can have the envelope turned off...most wahs or other filters have bypass switches though, so you will always be able to turn it on/off via a footswitch.
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