ABSYNTH 5 Reference Manual – 69
Main Panel
The highpass lters in ABSYNTH 5 contain the following parameters on their Main panel:
• FrequencycontrolandFrequencymenu: The Frequency control allows you to set the cut-
off frequency in semitones (Trans) or in Hertz (Hz), upon the selection in the nearby
Frequency menu.
• Resonancecontrol (HPF -12dB only): Sets the resonance at the cutoff frequency.
5.5.6 Allpass
Allpass lter Allpass 4
Allpass lters allow all frequencies to pass through the output with similar strength, but modify
the phase of the signal. Allpass lters are useful for creative ltering as they can easily produce
phasing or resonating effects. With allpass lters, the number of poles dene the number of
peaks in the frequency spectrum of the ltered signal. With high resonance values, an 8-pole
allpass lter can sound very similar to a bell.
The following allpass lters are available in the Type menu:
• Allpass2: 2-pole allpass lter.
• Allpass4: 4-pole allpass lter.
• Allpass8: 8-pole allpass lter.
Main Panel
Every allpass variant shares the following two parameters on the Main panel:
• FrequencycontrolandFrequencymenu: The Frequency control allows you to set the cut-
off frequency in semitones (Trans) or in Hertz (Hz), upon the selection in the nearby
Frequency menu.
• Resonancecontrol: Sets the resonance.
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