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I picked up an Alesis Philtre for $50.00
Its basically, a High Pass,Low Pass,Band Pass, &
Band Stop filter. Offers Frequency, Regen, Rate,
and, Depth controls. 24 Bit/48,000 Khz Sample Rate.
Modulation features; Triangle, Sample/Hold, Enevelope
Pattern, and, Tempo Sync.
Stereo too 
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OMNIFEX
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