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Filter Pro
The Filter Pro offers self-triggered and tempo-locked effects for processing guitars or just about any other sound source. It also includes a few guitar synth-style effects that rely on pitch tracking and processing the input signal, in which case you need to play monophonically and very cleanly to avoid the sound of a Dalek yodelling on a roller coaster! You might think that there are few classic filters to model, but in fact most of the patches relate to some original piece of equipment which is lovingly described in the handbook. Perhaps a list of the algorithm names would be useful here, as they're somewhat indicative of what to expect: Synth Strings, Attack Synth, Synth-O-Matic, Tron Up, Tron Down, Q-Filter, Slow Filter, V-Tron, Voice Box, Seeker, Obi-Wah, Throbber, Spin Cycle, Comet Trails, Octisynth and Growler.
The first eight effects aren't tempo sync'ed while the second eight can be sync'ed to MIDI note information. Synth String, Attack Synth and Synth-O-Matic are guitar synth emulations based on vintage Roland and Korg models and have a one-octave tune range up or down, but I found I had to play very carefully to get them to track properly — any hint of fret buzz sent them wild. Being generous, I could say Line 6 have successfully modelled the tracking idiosyncrasies of early guitar synths. There's a fair range of tonal adjustment on hand, with a plausible analogue synth sound at one end of the spectrum and something that sounds like a damaged ring modulator at the other. You're on safer ground with the Tron filter pedal, while Q-Filter is really just a static band-pass filter — if you have a pedal, you can use it to set up a wah-like effect. Other treatments include growly filters, vowel filters, sync'ed stepped filter (with 64 different patterns) for that sample-and-hold effect, an octave synth, something dubiously entitled the Throbber (inspired by the relatively recent Electrix Filter Factory), and a patch seemingly designed to imitate whale song!