JAF Model One by Jens Guell (Universal)
Released: Aug 9, 2019
Version: 1.3
Size: 12 MB
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Ranking - Music (iPhone)

Ranking - Music (iPad)

JAF Model One

Jens Guell
The MODEL ONE is a selected, fine-tuned general purpose (transistor ladder model) filter with the ability of strong self oscillation. The cutoff slope is approximately 24dB. It can be switched to low pass or high pass processing mode.

This audio unit is released for free, as a showcase for the quality and features of our unique filter collection of over 30 different filter models. The main app for the JAF Collection allows to switch between different classic filter models, including a fairly complete set of well known legendary synthesizer filters of the golden synthesizer age.

The Model One, like all our filter models, is a true stereo processing effect, which includes a special audio-rate (high frequency) modulation oscillator, that can modulate the main parameters of the filter to its extremes. The modulation oscillator is not related to the inbuilt unison oscillators, which is a complete separate, different unit.

All our models have also an inbuilt additional saturation unit for the extra bit of analog drive. This saturation unit and the oscillator section can be used without the filter module, because the filter unit can be switched to pass the incoming audio signals thru.

The available vintage warmer tube/tape saturation type for instance is an excellent choice for breathing life into any obvious digital audio material. It can be applied to entire mixes as to individual tracks and voices.

The IAA hosting app for the Model One has special MIDI connectivity, thus parameters can be automated with realtime MIDI Controllers (See MIDI implementation chart). 

The MIDI features on the audio unit depends on the fact, whether the host application will send MIDI messages to the plugin in any way with the audio processing block or not.

The audio unit can be loaded into all supporting audio unit hosts, but there are many different ones. At current state we cannot guarantee the seamless operation with all of these host applications. Please try the free MODEL ONE, before you eventually decide to purchase the commercial version "JAF Collection".

If successfully loaded into a host, all parameter automation and preset handling will be handled by these host applications.

What's new in version 1.3
(third maintenance update)

A: newdescriptor names

the Audio Unit and distribution host app descriptors were changed. the naming of the audio units caused much confusion, as some users were not able to find our plugins after installation.

the naming convention of formerly "Filter Model One" and "Filter Collection" are now
- "DGST: JAF Model One (AU)" and
- "DGST: JAF Collection (AU)"
the "DGST:" prefix always marks ALL of our audio units with the unique company identifier.

IMPORTANT NOTE : we highly recommend to deinstall the previous version and do a new install therefore!
existing projects possibly must be updated with the new instances.

B: parameters in AUM

especially for AUM, we implemented the "exotic" but ("required") flag for exposing the parameters. otherwise AUM will not publish any parameters, that are not flagged with a special "kAudioUnitParameterFlag_IsWritable" flag. This is somewhat "willful', because other hosts actually listed our parameter tree for automation correctly.

( more info on that in the version history on our product website )

C: several UI fixes

the new model selector menu, that came with update 1.2 introduced some new UI discontinuities. sometimes the selector was still (silently) active but visually disappeared. we fixed that.

D: toggling the contrast control overlay

the contrast button and the adjustor slider can be temporarily toggled with a long press gesture, making it disappearing/appearing again. we hope the new feature will improve user experience.

E: the 'pinch2zoom&move' can be locked now

we implemented a new 'freeze' button aside the contrast feature, that temporarily disables zooming and moving the interface. this button will also appear/disappear with the long press gesture.

F: there was a (possible) problem, using multiple instances with differing zoom adjustments. we fixed that.

G: gesture recognizer slightly changed

the previous implementations required to touch exactly inside the visible area of the user interface to be recognized. now all gestures are recognized on the entire window area of the audio unit's interface, which is much more logical and intuitive to use.

H. audio engine update delayed

some audio issues (like hot signals, loudness adjusting, additional comb effects) will come with the next update.
Screenshot #1 (iPhone)
Our verdict: Good
  • + JAF Model One is a highly rated app (5-star).
  • + The app is free.
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