Week 152: Build a “Virtual Room Mics” FX Chain
Let’s improve the acoustic environment in which your instruments live, by faking—uh, I mean, “emulating”—a pair of room mics.
Going direct with an instrument can sometimes seem “lifeless,” because in the real world the instrument will exist in a room with delays and reflections. These reflections can be important enough that many engineers (myself included) add room mics with miked instruments to pick up the room’s “sound,” and blend that in with the main instrument mic(s). But what if you don’t have a room, let alone room mics? Well, let’s create both with the “Virtual Room Mics” FX Chain.
This FX Chain consists of two Sonitus stereo delays in series. The main delay times are prime numbers, which means they can be divided only by themselves. As a result, they don’t reinforce each other or give a periodic sound, thus providing a bigger sense of space from a limited number of delays.
The first delay’s dry sound passes through the second delay to create the 23ms and 17ms delays. However, the first delay’s
delayed sound also passes through the second delay, which produces an additional delay of 11+23=34ms and 13+17=30ms; so there’s a total of six virtual reflections. Because the times are spaced close together, they’re not really perceived as individual echoes—but they’re also sparse enough so they don’t sound like reverb, either.
Set the initial control settings for both delays as shown above (if the parameters are hard to read, right-click and open in a new tab, or copy the image and paste into a paint program). Then, right-click in the FX Rack and choose “Convert FX Rack to FX Chain.” Next, right-click on the FX Chain and click “Add Knob” to add each of the four knobs. Here’s how to edit the parameters for the various knobs.
This effect is best when applied subtly, even though the ranges are wide enough so you can have less-than-subtle sounds if you want. To get a good sense of what this FX Chain can do, set the DiffTime, DiffAmount, and Reflections controls to 30% and the Mix control to 50%. Play a D.I.ed instrument like guitar through the chain, and it will sound like you’ve added a couple of room mics—which is the whole point of this FX Chain. Not bad, eh? Your studio just added a bigger room, and you have two new room mics, simply by creating an FX Chain. Have fun with your new acoustic space!