The Drop

The Drop Screenshot
Price: USD 99.00

The Drop Beta

The Drop is an analog modeled resonant filter plug-in that is currently in an open beta testing stage. It uses the same high quality algorithms used in circuit simulation packages but optimised for real time use. There is a huge level of detail in the models, which gives them amazing drive and tone, but also takes a large chunk of your CPU. As well as the full circuit models more efficient algorithms will be included for situations where CPU considerations are more important than tone, but even these models are of the highest quality.

Even though the product is currently in an open beta testing stage, it can still be purchased immediately. The advantage is you get to use it straight away in your production, but since it is in Beta there may be some issues to resolve. The preset format is final and so songs saved with the Beta will always continue to load properly with the full version once it's ready.

The Drop - Installation and Quickstart.pdf

The Drop - Release Notes.pdf

Cytomic - Software License Agreement.pdf

Audio Units RTAS VST Mac OS X Universal Binary Windows Vista

Known issues / Features missing in the Beta

  • Not all the circuit models are finished. The final lineup will be SallenK MS1 (based on the MS10/20 mk1), SallenK MS2 (based on the MS20 mk2), StateV OSR (based on the OSCar SVF), Cascade SHJ (based on the SH-9 / Juno-6), and LadderT PRD (based on the Prodigy transistor ladder filter)
  • No presets just yet
  • No Led indicators showing the Lfo, Env1, and Env2 levels
  • Possible clicks when toggling LpActive and HpActive buttons, this will be smoothed
  • Slight clicks when changing circuits which will remain in the final version
  • Midi triggering needs a legato mode
  • MIDI learn not done yet
  • Sens knob on envelopes only currently works with Audio input, not MIDI
  • Envelope Trig mode not yet implemented for audio sources, it currently just uses Gate mode all the time which is a regular envelope follower circuit
  • Entire plugin needs more optimisations

The Drop Beta Trial Version 0.9.18 (10 Sep 2013)

Audio Examples

The Ladder High and Low

Some 4 pole high pass and low pass action from a transistor ladder filter. The wobbles near the end are from the self oscillation of the high pass filter modulating the cutoff of the low pass, no LFOs were used, this is just the filters doing their thing. Drums are from the Vinyl Classics Live Pack and the dry and linear sawtooth waveform provided by Strobe, the same midi is sent to The Drop for triggering the envelopes and keytrack of the cutoffs.


With the pre and post gain as modulation destinations you can create pumping and panning effects with The Drop as well as filtering, in this case with the Sallen Key circuit model. The Drop is also used in high pass mode as an EQ on the kick and snare to add body with a little resonance and keep the sounds in mix tight be removing unwanted low frequencies. Drums are from the Goldbaby Urban Cookbook, the synth is Strobe with its filter switched off.

One Sided Tranny

A high and low pass transistor core Sallen Key MS1 circuit model is put through its paces on a sawtooth bassline which builds into a pad and then beat. The high pass filter in this example is a new circuit design to achieve 2 poles of high pass filtering as the original circuit the model is based on was only 1 pole, which isn't enough for most uses. Drums are from the Goldbaby Urban Cookbook and from MicroTonic, the pad sound is from Synplant, and the sawtooth bassline is from a Cytomic test oscillator.

Morphing LFO

This example puts the smoothly morphing LFO through its paces. The LFO can be synced to BPM, and automatically retriggered, so you can smoothly alter the rate but still stay in time with your music. The shape can morph between triangle, to saw up and saw down, and an exponential curve amount which can make the LFO sound like an envelope or square wave. There is also a swing parameter and stereo offset, and best of all is you can tweak them all the parameters in real time in very musical and expressive ways. This example was generated at 44.1kHz with no oversampling.

Driven Drums

This example uses the Sallen Key circuit model. The lowpass and highpass filters are swept around on a drum loop. The Drive control is increased gradually and once the filters are swept out of band the signal is completely clean again.

Feature Summary

  • Dual stereo resonant filter with a Highpass into Lowpass
  • Circuits include Sallen Key, Cascade, and Ladder (currently only Sallen Key MS2 available)
  • Stereo and Mono processing with either 2 or 4 poles
  • Loads of drive and character
  • Full frequency range and perfect resonance tracking without oversampling so there is no latency in processing
  • Huge amounts of resonance if you want and also "Safe Res" button for DJ use where screaming self oscillation is not desired
  • A powerful morphing LFO capable of audio rate stereo modulation
  • Two analog modelled AHR envelopes that double as envelope followers, one for the cutoff and one for amplitude
  • FM from main audio input or sidechain audio input
  • DSP coded using C++ and SSE2, Interface coded using the Juce framework (C++)
  • Serial number copy protection with generous license agreement, but no license transfers

Circuit Modelling and DSP

Cytomic uses the same circuit modelling techniques that are used in professional circuit simulation packages but optimised for real time use. The structure including all feedback loops and useful non-linearities of the original circuit has been preserved. The algorithm uses actual values for resistors, capacitors, diodes, transistors and other circuit components. The voltages and currents are solved in real time and match as closely as possible to the analog circuit in both the time and frequency domains.

Minimum System Requirements

  • Vst 2.4, Au, or Rtas compatible host that can handle 4 input 2 output plugins (stereo sidechain)
  • Mac: Intel OS 10.5
  • Win: XP / Vista / 7 with SSE2 CPU

Tested And Working Hosts

If your host is not listed below then please make sure the trial version is working correctly before you purchase.

  • Logic v7.x, 8.x, 9.x
  • Live v6.x, 7.x, 8.x
  • Pro Tools v8.x
  • Cubase v5.x
  • Reaper v4.x
  • Sonar v7.x