tiptop audio z-dsp (with dragonfly delays card) price : $480.00
bat filters card price : $65.00

welcome to the world of the z-dsp, the open source digital sound processing and generating platform for your modular synthesizer. the z-dsp is a stereo dsp processor, with 24-bit sampling, 15khz of bandwidth, voltage controlled parameters, and has the ability to be programmed with a powerful assembly language - all in a eurorack format. the z-dsp gives you all the tools you need to control and manipulate digital effects to explore the new sonic spectrum dsp is bringing to the modular synth, including; vc digital parameters, vc mix/dry, manual and sequential program switching and a pair of vc feedback-loop path with exposed patch points that let you insert the rest of your modular inside the dsp process. on top of that the z-dsp lets you go far beyond ordinary processing, breaking the rules and allowing you to patch right into the heart of the dsp chip, through the clock input, for some digital madness. let your fingers explore the knobs, let your synth explore the vc. dial up a stereo delay, only to have your sequencer switch it automatically to a multi-tap at the start of the next measure. and when you're done shifting time, switch to a cartridge full of filters for multi-filter processing like you've never heard. or explore a block of digital oscillators, or ... the z-dsp... the only true limitless module in your rack.

click here to download the z-dsp user manual.

about the bat filter:
the bat filters card is a collection of 8 voltage controlled digital filters (vcdf).

compared to their analog cousins, digital filters are precise and deep. they can remove or pass selected harmonics smoothly or aggressively depending on how they're configured. the result is special character that brings a whole new sonic dimension to the analog modular synthesizer.

the bat filter algorithms are based on the chebyshev filter topology. they're pumping at low frequencies, smooth and pleasant at mid range, and aggressive up top as the audio frequency gets closer to the dsp sampling rate. one of the biggest advantages of digital filter design is the ability to cascade filters with no gain loss or added circuit noise like with analog filters. this results in filters with up to 8poles, a slope of 48db!! that's equivalent to having four 12db analog filters in series, yet maintaining a clean, strong signal at the output.

the bat filter contains the following algorithms:
program - a dual stereo 8pole low pass filter. each filter has a separate cutoff on the z-dsp with common resonance.
program - dual 8pole band pass
program - 4pole high pass / low pass in series
program - 8pole high pass / band pass in series
program - 8pole triple band reject (notch filters)
program - 8pole high pass / band reject in series
program - stereo resonator, a unique dynamically varied structure of filters creating a powerful resonator with stereo spread control, ideal for pads and drones
program - stereo 8pole high pass filter with stereo spread control