MAM WARP 9
The Warp 9 from German Co. MAM (Music And More) is an economical analog multi-mode filter for processing external mono audio. Its filter is based on that of the classic EDP Wasp from 1978, utilizing a 12dB/oct (2-pole) resonant filter with switchable lowpass, highpass, bandpass, and notch modes. There is a built-in ADSR envelope with Delay and an LFO with 9 waveforms for modulating the filter's effect. The LFO can also be MIDI clock synced for tempo matched modulation of the filter's cutoff, resonance, etc. Other common analog filter effects such as Distortion, Velocity and Key tracking are also on-board. The LFO and VCA alone can lead to some creative modulated filter effects! The Warp 9 has full MIDI implementation which can send/receive all of its parameters.
In it's price range, the Warp 9 is competitively priced with the Vermona DAF1. Both filters offer the same types of filtering except the slightly more expensive DAF-1 has 4 filters, 24dB/oct (4-pole) slopes, and accepts stereo audio. However, the Warp 9 has something the DAF-1 doesn't, patch memory! The Warp 9 has 32 memories for storing your favorite filter settings and effects. The Warp 9 is one of the cheapest analog filters around and is best suited to processing your other synths, guitars, vocals, and effects rather than entire mixes or anything stereo. You can use it to add that analog sound to your digital synths, or to "Warp" them with the wacky sonic modulations it has the potential to deliver!
Images from MAM - Music And More.