PreSonus Blog

Friday Tips: Studio One’s Hybrid Reverb

The previous tip on creating a dual-band reverb generated a fair amount of interest, so let’s do one more reverb-oriented tip before moving on to another topic.

Studio One has three different reverbs—Mixverb, Room Reverb, and OpenAIR—all of which have different attributes and personalities. I particularly like the Room Reverb for its sophisticated early reflections engine, and the OpenAIR’s wide selection of decay impulses (as well as the ability to load custom impulses I’ve made).

Until now, it never occurred to me how easy it is to create a “hybrid” reverb with the best of both worlds: using the Room Reverb solely as an early reflections engine, and the OpenAIR solely for the reverb decay. To review, reverb is a continuum—it starts with silence during the pre-delay phase when the sound first travels to hit a room’s surfaces, then morphs into early reflections as these sounds bounce around and create echoes, and finally, transforms into the reverb decay—the most complex component. Each one of these components affects the sound differently. In Studio One, these components don’t all have to be from the same reverb.


Start by inserting the Room Reverb into an FX Channel, and calling up the Default preset. Then set the Reverb Mix to 0.00 and the Dry/Wet Mix to 100%. The early reflections appear as discrete vertical lines. They’re outlined in red in the screen shot below.


If you haven’t experimented with using the Room Reverb as a reflections engine, before proceeding now would be a good time to use the following evaluation procedure and familiarize yourself with its talents.


  1. From the Browser, load the loop Crowish Acoustic Chorus 1.wav (Loops > Rock > Drums > Acoustic) into a stereo track. This loop is excellent for showcasing the effects of early reflections.
  2. Create a pre-fader send from this track to the FX Channel with the Room Reverb, and bring the drum channel fader all the way down for now so you hear only the effects of the Room Reverb.
  3. Let’s look at the Room parameters. Vary the Size parameter. The bigger the room, the further away the reflections, and the quieter they are.
  4. Set the Size to around 3.00. Vary Height. Note how at maximum height, the sound is more open; at minimum height, the sound is more constricted. Leave Height around 1.00.
  5. Now vary Width. With narrower widths, you can really hear that the early reflections are discrete echoes. As you increase width, the reflections blend together more. Leave Width around 2.00.
  6. The Geometry controls might as well be called the “stand here” controls. Turning up Distance moves you further away from the sound source. Asy varies your position in the left-right direction within the room.
  7. Plane is a fairly subtle effect. To hear what it does, repeat steps 3 and 4, and then set Size to around 3.00, Dist to 0.10, and Asy to 1.00. Plane spreads the sounds a bit more apart at the maximum setting.


Now that you know how to set up different early reflections sounds, let’s create the other half of our hybrid reverb.


To provide the reverb decay, insert the OpenAIR reverb after the Room Reverb. Whenever you call up a new OpenAIR preset, do the following.

  1. Set ER/LR to 1.00.
  2. Set Predelay to minimum (-150.00 ms).
  3. Initially set Envelope Fade-in and Envelope ER/LR-Xover to 0.00 ms.

There are two ways to make a space for the early reflections so that they occur before the reverb tail: set an Envelope Fade-in time, an Envelope ER/LR-Xover time, or both. Because the ER/LR control is set to 1.00 there are no early reflections in the Open AIR preset, so if you set the ER/LR-Xover time to (for example) 25 ms, that basically acts like a 25 ms pre-delay for the reverb decay. This opens up a space for you to hear the early reflections before the reverb decay kicks in. If you prefer a smoother transition into the decay, increase the Envelope Fade-in time, or combine it with some ER/LR-Xover time to create a pre-delay along with a fade-in.

The OpenAIR Mix control sets the balance of the early reflections contributed by the Room Reverb and the longer decay tail contributed by the OpenAIR reverb. Choose 0% for reflections only, 100% for decay only.


There are other advantages of the hybrid reverb approach. In the OpenAIR, you can include its early reflections to supplement the ones contributed by the Room Reverb. When you call up a new preset, instead of setting the ER/LR, Predelay, Envelope Fade-In, and Envelope ER/LR-Xover to the defaults mentioned above, bypass the Room Reverb and set the Open AIR’s early reflections as desired. Then, enable the Room Reverb to add its early reflections, and tweak as necessary.

It does take a little effort to edit your sound to perfection, so save it as an FX Chain and you’ll have it any time you want it.