IO Filter is a paraphonic multifilter. 

This effect is driven by a sophosticated GUI envelope. Default time value is in second. Duration is theorically infinite so this enveloppe can run from 1 nanosecond to several minutes, hours...

• Multimode filtering: LP, HP, BP, Peak.
• Cascade filtering up to 4 stages (stack).
• Advanced GUI envelope up to 32 stages.
• Loopable or 1 shot.
• Host-Bpm syncable.
• Individual curve-type for each segment.
• High precison editing.