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Roger Linn Design AdrenaLinn

Filter, Effects, Amp Modeller & Drum Box
By Paul White

It's a sequenceable filter, it's an amp modeller, and it's a drum machine... it's the AdrenaLinn, the new guitar processor from famed designer Roger Linn, best known for his classic drum machines and sequencing workstations.

The AdrenaLinn is the first product from Roger Linn Design, and was designed by a team that includes Roger himself (inventor of the LinnDrum drum machine) and Dave Smith, formerly of Sequential Circuits and probably most famous for helping to conceive MIDI. As Roger explained in a recent interview (see SOS June 2002) he is actually a guitarist, and invented this box because he thought it would be fun to have one, but the AdrenaLinn can also be used to process synths, drum machines and just about any other sound source you care to feed into it. So what exactly is it?

What It Is

Roger Linn Design AdrenaLinn.Photo: Tom FlintThe AdrenaLinn is essentially a mono-in, stereo-out effects processor in stomp-box format but is unusual in that it includes a simple drum machine based on two-bar measures, a modelling guitar amplifier of the type we're all now quite familiar with and a sequencer-driven filter section with up to 32 steps that can work in sync with the drum machine. Alternatively, the whole machine can be locked to MIDI Clock for full integration with a MIDI sequencer. Though it is possible to create traditional filter effects such as wah and flange, the real reason for AdrenaLinn's existence is its ability to create stepped rhythmic filter treatments. The effects on offer include synth sample-and-hold style sounds, rhythmic tremolo patterns and tuned flange patterns that pick out a musical scale from any wide spectrum input, including percussion, and other rhythmic treatments.

The signal path can route the filter into the guitar amp model, like a traditional wah-wah, which is always placed before the amp, or you can switch it and feed the amp model into the filter, which gives the filter more to work on if you're using an overdriven model. The output of this combination then feeds a separate delay unit, which may also be tempo-locked. It's also possible to feed the drum machine through the amp/filter section for some cool, grungy rhythmic effects. To get started, there are 100 preset drum machine patterns plus 100 preset effect treatments, with space to add another 100 of each of your own. A number of pattern swing options are independently available to the drum machine and filter sequencer which not only extends the usefulness of the factory drum patterns significantly, but also opens up rhythmic opportunities for combining a drum part of one feel with a filter sequence of a different feel.

Editing is accomplished by a fairly simple matrix system where rows of parameters are addressed via knobs at the top of the rows and selected by means of buttons down the side. Owners of Emagic's SoundDiver can also download an editor module free of charge (both Mac and PC) from, which brings all the parameters out to a screen of virtual sliders. This is useful, because while editing from the front panel is not actually difficult, it can be time-consuming.

The Box

Housed in a blue cast-metal case, the AdrenaLinn has a tough printed laminate front panel, and there's a window for the three-character LED used to display patch numbers and parameter details when editing. The input and stereo outs are on unbalanced jacks on the rear panel and power comes from an external 7.5V power adaptor. MIDI connectivity is in the form of MIDI In and Out connectors, and a trim pot and clip LED on the front panel allow you to match the input gain to your instrument, though I found there wasn't enough gain to get the clip LED to come on at all with my Strat.

The control surface comprises two footswitches, four knobs and five buttons; the footswitches are generally used for rhythm start/stop and bypass. Pressing and holding the Start switch when the machine is stopped provides a one-measure count-in, whereas if the machine is already playing, it stops at the end of the current measure. Holding down Bypass works as a kind of tap tempo, where the tempo is set by holding it down for one measure.

The four knobs select the Preset, Drumbeat, Tempo and Volume as their main function but pressing and holding the Main button switches them to a second mode (denoted by printing beneath the knobs) that's most likely only to be used when setting up. The first knob defines the way Bypass works; it can be a conventional bypass or can be made to switch between the current and newly selected patch. There's also the option to restart the current measure for situations where you're playing without sync and may occasionally need to manually sync the measure start point to whatever you're playing along with.

Next is Dir-Amp/Gate, which allows the selection of four options. Dir provides a speaker simulated output for feeding a PA or recording system, while Amp switches the simulator off. The remaining two options are the same but with the built-in noise gate disabled. This can only be on or off — it has no user adjustments, but the operation seemed to be pretty well optimised. Knob three is labelled Use Drumbeat Tempo and dictates whether AdrenaLinn follows the tempo of the loaded drum patch or whether the last used tempo will be used for all patches. Finally comes Balance/Sep, which sets the relative balance of the drum machine section and the amp/effects section. A useful touch is that moving the knob past the position where the display shows 'd50' sends the instrument to the left output (in mono of course) and the drum machine to the right.

Try it Now!

Editing patches isn't too scary as all the parameters are shown in the printed matrix on the front panel and are neatly sectioned into Preset, Drumbeat and MIDI areas. Editing patches isn't too scary as all the parameters are shown in the printed matrix on the front panel and are neatly sectioned into Preset, Drumbeat and MIDI areas. To try the machine in 'instant gratification' mode, all you need do is use the four knobs to select the drum and effect patches, set the tempo and adjust the volume. Editing patches isn't too scary as all the parameters are shown in the printed matrix on the front panel (see above) and are neatly sectioned into Preset, Drumbeat and MIDI areas. Nevertheless, you do need the manual at first to remind you what the abbreviated parameter names that crop up in the display actually stand for. The two buttons to the left of the rows step up and down through the rows as indicated by status LEDs at the start of each row, and turning the knob above the parameter name in the illuminated row makes the adjustment. The same two buttons are used as Effects and Drumbeat Store buttons by pressing and holding them. This allows you to select a user memory into which to save the settings, after which you push the button again.

The effects are based around filter types that can change their parameters for every step of the 32-step sequence and six filter types are available. The first is a (variable) resonant low-pass, 12dB-per-octave synth-style filter, while filter two is a 24dB-per-octave synth filter reminiscent of those used in vintage Moog instruments. Then come normal and inverted flanging, pitch modulation and finally volume. By adjusting the volume of each sequenced step, you can set up extremely rhythmic gating effects; the easiest way I found of doing this was to pick a rhythmic tremolo effect and then edit it to control the volume via MIDI Note velocity. All you need do then is create a line of 16 or 32 consecutive MIDI notes in your sequencer edit page and then turn the velocity full up on the beats you want to be loud and down on the beats you want to be quiet. Loud beats will continue until a low-velocity note is encountered, so it is essential that loud notes are separated by quiet notes. When you have a pattern you like, you can loop it.

Moving on to the amp-modelling section, this includes 12 models based on all the classics that just about every other amp model seems to include (famous UK and American amps plus a couple of high-gain specials, a fuzz box and lean DI sound). The variable parameters for each model are Drive, Bass, Middle and Treble.

The delay section is fairly conventional, but can again be set manually up to one second of delay or linked to the sequencer with delay times from half a measure to 32nd-note triplets, within the limitation of the maximum delay time. A variable feedback parameter sets the degree of repeat, and the delay level can be controlled relative to the main signal.

Filter Tips

What makes the effect interesting is the way in which the filter frequencies can be modulated, and each can be controlled by the sequence, by an envelope generator, an internal LFO, the audio envelopes or the peak (held) level or by five external MIDI sources (Note, Velocity, Bend, Controller or MIDI Pressure). Additionally, several of the modulators can themselves be modulated by other internal sources or external MIDI parameters.

Rhythmic filter effects are based on filter sequences (each sequence can comprise 16 eighth notes, 24 eighth triplets or 32 16th notes) where each step can have a modulation value from 0 to 99, in addition to the ability to trigger the envelope generator when the sequencer moves to that step. A secondary mode of the edit matrix is used to edit the filter sequence and is accessed using the Sequencer button, after which 'L' shows in the display, indicating that levels can be adjusted. Pressing Sequencer changes the display to 'Eg' showing that the envelope generators are being edited. Selecting 'Eg0' disables the envelope for the current step whereas 'Eg1' means the envelope will trigger at the current step. The modulation envelopes have variable attack and decay or release depending on which mode is selected, while the LFO has four waveforms plus random. The LFO rate can be set conventionally or related to the sequence tempo, ranging from one cycle every eight bars to one cycle every 32nd-note triplet in a number of steps.

A further alternative mode of the edit matrix is used to edit the drum beats in step-time fashion, based on a library of 40 drum samples that can be arranged as eight, 12 or 16-note measures with various degrees of swing. Most drum voices are played at a fixed level (the kick, snare or hi-hat note can play at one of three volume levels) and although there's no means to chain patterns, the machine can play basic intro patterns. This is a simple beatbox to play along to, but it has an excellent feel, and is capable of producing some great sounds that would make fine sample loops.


Using MIDI, the internal tempo can be locked to incoming MIDI Clock along with Start, Continue and Song Position pointer capability. Alternatively, AdrenaLinn can send MIDI Clock to its own output. The MIDI setup allows MIDI to be selected as an envelope trigger source, with or without program changes, and there's also the facility to dump or load patches via MIDI, either as drums plus effect preset or separately. The most exciting aspect of MIDI control, other than keeping things in time, is the ability to control effects in real time using MIDI patterns stored in a sequencer.

In Use

So, is AdrenaLinn likely to increase your heart rate? The answer really depends on what you want to get out of it. As a drum machine, it is a little simple by today's standards (good though it sounds), and similarly the guitar modelling compares well with its contemporaries, but it lacks reverb or ambience, so you need to add this some other way. When I first tried one of the original AdrenaLinns, I found the amp models to be noisier than expected, but on the review model (which is how all the production models will be from now on), the performance was much improved in this respect. Even on those earlier models, noise was not a problem when creating filter effects, as the filters tend to clean up the sound quite dramatically (or in the case of tuned filters and flangers, the filtered noise becomes part of the effect), and when separating the drum and guitar outputs, the drum machine was always quite clean. However, the improvement is quite noticeable when using the guitar models on their own.

Roger Linn Design AdrenaLinn

AdrenaLinn isn't really about drum patterns or amp modelling, though — it's about creating rhythmic filter and tremolo effects that you can't get easily by any other means. We've all heard those great rhythms you can get by patching the output from a drum machine into the side-chain trigger input of a gate, then using it to chop up guitars, but AdrenaLinn takes that kind of concept much further. The tuned flange, for example, imposes a recognisable musical scale onto anything from damped guitar to drums, and by setting it to trigger from external MIDI notes as in patch 98, you can use a sequencer to make it play anything you want to. The sound is hard to describe, but has that 'tearing' quality of synth phase-sync. Even if you never program your own patches, the fact that the factory menu includes some MIDI-triggerable tricks means you can still get the effects to match your sequencer songs.

The other fun thing is to feed the drum machine through the effects section where it can be distorted and filtered in a variety of ways, producing the kind of results you normally have to buy a sample CD to achieve. Because the drum beats are so easy to customise, you can create any number of precisely tailored down-and-dirty sample loops from a machine that costs around twice the price of a typical sample CD-ROM. I also found feeding bass guitar through the filters was an easy way of getting a groove going in conjunction with the drum machine, so don't restrict your source material to guitars.

Though rhythmic effects are what AdrenaLinn does best, the factory patches include 20 simple guitar amp models plus effects. These have a good dynamic response and are probably as close to the amps they purport to emulate as anyone else's, though you will probably want to add reverb somewhere along the line.

The stand-alone modulation effects, ranging from rhythm-locked filter, flanger and tremolo treatments to rotary speakers and auto-pan are also useful to have on hand, so for the most part, the AdrenaLinn makes a good general-purpose audio toolkit in addition to its rhythmic filter and beat box capability.


If you just want to play guitar, AdrenaLinn may not be quite your bag, but if you're the kind of person who loves rhythms and likes experimenting, then you can get a lot out of it, whether by modifying presets or coming up with your own unique patches. I enjoyed using it so much that despite some criticisms, I bought one. Just playing around with the effects stimulates new ways of thinking about rhythm and composition, and just about any sound source can be turned into something interesting. It would also be wrong to underestimate the usefulness of the drum machine, because even though you can't chain patterns or create songs, it is superb for creating powerful grooves that really swing, and it's easy enough to overdub additional parts using your sequencer.

AdrenaLinn is a unique effects box and has lots of creative applications both live and in the studio. My own view is that when people grasp what it's about, it will quickly establish itself as a cult product that will be much talked about in the years to come.


  • Unique rhythmic filter and gate effects.
  • Includes a surprisingly useful drum machine.
  • Affordable — a true impulse purchase.
  • Can be sync'ed to MIDI and controlled from MIDI sequence data.


  • Some of the display abbreviations are a touch cryptic.
  • Editing from scratch can be long-winded.


Using an AdrenaLinn is a great way to dig yourself out of a musical rut, and should appeal equally to preset-bashers and programming types.


£299 including VAT.

Published September 2002