Free
TIJN 50
Fifty Year Anniversary Model.
Free. No account, no licence key.
203 downloads

A filter and drive effect, built as a birthday present and free for everyone. Two filter slots, five circuit models each, fed hot enough that the filter’s own saturation is the distortion, with the cutoff able to move at audio rate.
Get the highlights.

For Martijn
Happy 50th.
Half a century on this earth, and a good chunk of it spent chasing the hardest kicks and the dirtiest basslines Dutch soil ever produced. E-Rick & Tactic tearing up Thunderdome with “Hardcore Rules The World.”
Martijn, we’ve been friends for more than 25 years now. Here’s to you, brother.

What it is
A filter you drive too hard.
Two filter slots, each a model of a real circuit, with a drive stage in front and a transformer at either end. The distortion is not a separate box after the filter: it is the filter, limiting on its own resonance path.
It opens as a wire, so putting it on a track changes nothing until you do. Green is always frequency, red is always resonance, white is always level.
The circuits
Five circuits, not five settings.
MOOG, 2044, JUNO, 101 and SEM, each modelled from its own schematic or data sheet. Two octaves below the cutoff, with the resonance up, they sit fourteen decibels apart, and that spread is left exactly where the measurement found it.
Every circuit oscillates near the top of its resonance. SERIAL sends the first filter into the second; PAR runs both from the same input, for two resonant peaks at once.
Drive and iron
Forty decibels in, iron at each end.
DRIVE is the gain into the filters, up to forty decibels. The output takes most of it back but not all, because taking all of it back makes the control feel dead.
IRON is a transformer model, not a waveshaper. Saturation follows the flux in the core, so it colours the bottom and leaves the top alone. At zero it returns the sample unchanged, bit for bit.
Movement
A follower, audio-rate FM, two LFOs.
FOLLOW opens both cutoffs with the level of what comes in, up to six octaves, compensated so a mix stays within a decibel or two. FM DEPTH moves the cutoff up to five octaves at up to eight kilohertz: a wobble down low, metallic sidebands in the hundreds.
The matrix is four slots: the follower, an envelope per hit, two LFOs free or synced, and the ribbon. A modulated knob grows a second pointer at the value the filter is actually using.
Sidechain and ribbon
Let another track open the filter.
Switch SC on and route a kick to the sidechain input: the follower listens to that instead. A highpass and a lowpass sit in front of the detector and nowhere else, and Listen plays what it hears, so they can be set by ear.
The ribbon is a touch strip under the panel and a source in the matrix, in Relative, Absolute or Hold. The host can record it, and a controller can move it with MIDI learn.
Aliasing
Measured, not assumed.
With the FM off, the drive and the filters fold back at minus a hundred and fifteen decibels or quieter on four of the five circuits. 2×, the default, covers everything up to and including deep FM; 4× goes up to twenty-three decibels quieter where it counts.
The latency is printed in the black bar and reported to the host, and the dry path is delayed to match, so the wet control is a mix and never a comb filter.
Presets and MIDI
Fifty-six places to start.
Fifty-six presets in nine groups, stepped with the arrows or picked from the menu. Right-click any control for MIDI learn. The whole manual is inside the plug-in behind HELP, and every preset is on this site, rendered straight from the plug-in.
Tech specs
- Filters
- Two slots, five circuit models each, serial or parallel
- Circuits
- Moog ladder, SSM2044, Juno IR3109, SH-101, SEM state variable
- Slopes
- 24 dB per octave on four of them, 12 dB and continuous LP–notch–HP on the SEM
- Drive
- 0 to 40 dB into the filters, in whole steps
- Iron
- Transformer model at input and output, frequency dependent by construction
- Movement
- Envelope follower; sidechain with highpass and lowpass; audio-rate FM to 8 kHz; two LFOs, free or host-synced; touch ribbon
- Matrix
- Four slots, signed amounts, modulation shown on the knob
- Oversampling
- 1× to 16×; latency reported, dry path delayed to match
- Internals
- Double precision through the filters and the drive
- Presets
- Fifty-six in nine groups; MIDI learn on every control
- Formats
- macOS and Windows: VST3, Audio Unit (macOS), Standalone
- Version
- 1.1.0
Free, and Martijn gets it first.
The engraving under the wordmark stays. For everyone else: free, for macOS and Windows, with no account and no licence key.