Pretty cool unit that I had a lot of fun with, but I don't use it anymore.

Fully working: all knobs, buttons, displays, inputs and outputs tested.
Used only in home studio.

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Line 6 Filter Pro, the rackmount version of the FM4 Filter Modeler (the purple stompbox), released in the early 2000s as part of the Studio Modeler series alongside the Echo Pro and Mod Pro. Long discontinued.

It packs models of classic filters and synths: Mu-Tron III, Z.Vex Seek Wah, Oberheim VCF, Electrix Filter Factory, talk box, Moog, ARP, Oberheim and Sequential Circuits style synths, Korg X911, and more. It covers everything from funky auto-wah to truly strange textures, and works just as well on guitar or bass as on synths, drum machines or mix tracks.

The power needs only a basic IEC cable, which can be included if you ask.

Feel free to ask questions.

Features:

• 24-bit processing and A/D/A conversion
• 99 User definable programs
• MIDI Clock Sync
• Tap Tempo
• Innovative Tempo controls translate between seconds and BPM
• Musical note variations for rhythmic freedom
• XLR (balanced) and 1/4 inch (unbalanced) Inputs and Outputs
• MIDI in and software selectable MIDI out/thru
• Input/Output Level controls
• A variety of mix options, including: Dry, Analog, Input Mute and All Mute
• Completely user definable MIDI Map
• TRS Stereo in/out for convenient effects loop connectivity
• Universal power supply

Filter Pro Studio Modeler Models based on*:

• Mu-Tron III (Up Position)
• Mu-Tron III (Down position)
• Zvex Seek Wah
• Oberheim VCF
• Voice Box
• V-Tron
• Electrix Filter Factory
• Spin Cycle
• Comet Trails
• Slow Filter
• Octisynth
• Moog, Oberheim, Sequential Circuits & ARP Synthesizers
• Korg X911 Guitar Synth
• Growler
• Q Filter