The ZapFilter^2 VST2.0-Fx Plugin is a very powerful filter-box with two
filter-engines and a distortion/saturator unit.

You'll love the warm sound and the groovy sweeps it can create.
Also very, very nice for live-play: Switch presets ultrafast with
your midi-keyboard and modulate the filters via modwheel.

Click to enlarge

v1.6 specifications:

• Two seperate stereo filter units with 15 switchable filter
algorithms with serial/parallel routing
• host-bpm syncable bipolar LFO->Cutoff modulation per filter-unit (tri, sqr, sin, saw)
• Envelope Follower per filter-unit with Amount(bipolar)/Attack/Release and tight/relaxed sensing with sidechain option
• Saturation/Distortion unit with drive/shape control
• 16 programs
• Internal Preset Manager with:
- copying/pasting of presets
- automatable preset-switching via VST Read/Write Automation
- saving/loading of standard .fxp/.fxb preset-/bankfiles
• custom default bank loading at startup
• Unique FreeEnv-Controller to draw Freq->Volume graphs
• Full VST-automation support of all parameters
• Program switching via MIDI-Note-On (Midi Ch.15) (will also reset LFOs in sync)
• Cutoff-Modulation via Midi CC's
• Link-Mode for Cutoff1/2 (with offset)
• 4 vu-meters for Input/Output and output of each filter
• final output limiter
• comes with 5 preset banks (80 ready to use presets)

Big big credits go to:

DubJay, who did the MAC port.

All the cool people who participated in collecting all the filter-algos and
routines on the musicdsp archive.
( http://www.musicdsp.org/ )
Many thanks especially to bram for maintaining this superb knowledge-base.
The source code of the filter part of this plug will also available soon,
to play around with the filter-algos and to add new algos.
If you are interested in plugin programming, don't miss to visit #musicdsp
on Efnet via IRC.