User manual

15User Guide Action Filter 4
EN
Figure 9: The frequency range being rejected by the notch filter shown as “fan”
With both CUTOFF controls pointing towards each other, both filter-signals overlap which results
in a slight emphasis in the overlapping area.
RESONANCE - nothing to boo
Resonance in a filter is achieved by internal feedback. This leads to amplification of the frequencies
around the CUTOFF value. Resonance generates a change of timbre that will sound synthetic with
increasing intensity.
Unlike filters used in synthesizers, such as our PERfourMER MKII, the resonance in Action Filter 4
will not reach self-oscillation. The resonance has been restricted with intend to avoid uncontrollable
feedback of the sound, especially during live performances. No matter how you set the Action Filter
4, it will not damage your gig.
STYLE - do you like it hard or soft?
The first Action Filter utilized a slightly raw sounding circuit. We optimized the sound in the next
revision which lead to a smoother sound experience. It turned out that some users preferred the
rawer, some the softer sounding Action Filter revisions. It is impossible to make everyone happy,
isn‘t it? We guess we found a way! The STYLE switch allows toggling between ROUGH, which
equals Action Filter 1 and the rounder sounding SMOOTH position. It’s your choice!