Philtre (audio device)

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Philtre is a now-discontinued Alesis desktop effects device that can do the following:

Select either low pass, high pass, band pass, low pass alias, or any combination as filter types. Five different modulation waveforms can be selected, each of which can be beat-synchronized. The Reset Mod button will reset the phase of the LFO. A Steep button switches between 4- and 6-pole filters.