As a self-admitted envelope filter junkie, and after owning/trying 40+ filters, here's my top 3, in order:
1. Pigtronix Bass Envelope Phaser - with honorable mention to the BEP's predecessor the EP2, which I still also have (modded with a volume knob by Dave Koltai at Pigtronix).
2. Line 6 Helix Auto Filter - Listed as a "Line 6 original," but seems heavily based on (and "about 90% there" to) a Lovetone Meatball.
3. Proton V2 - Had the Fromel V1 and upgraded to the V2, which I still have. Didn't really feel like V3 was that big of a change, so skipped that one. I've always regretted not getting a V4 before 3Leaf went dormant for a while, so definitely hoping I can snag one with this upcoming drop.
That said, if I had to choose a "there can be only one" filter, it'd be the Source Audio C4, because I've been able to program a lot of killer envelope filter sounds on it that are MIDI accessible: Bassballs, Filter Twin, a passable Bass Envelope Phaser sound, among other various clean and dirty envelope sounds (most of which are posted on the Neuro Community, for those that have the SA pedals). And in addition to being able to load Spectrum presets, the C4 has synth.
I've been eyeing that FTelettronica for a while now. Super tempted due to nostalgia for the Grinder, but holding me back is the fact that I probably wouldn't actually use it on a pedalboard due to size, and having the Auto Filter mentioned above. Still though.... I've got an itchy clicker finger for that one.
5sg.
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