PreSonus Blog

Friday Tip of the Week: Create Virtual Room Mics in Studio One

Create Virtual “Room Mics”

Room mics can add ambiance and enhance the stereo image, but with close-miking and direct injection recording, we lose that sense of space. The lack of room mics is particularly noticeable with an instrument recorded direct, when it’s mixed with miked acoustic or electric tracks; the direct track just won’t seem to mesh quite right with the other sounds.

Room mics add short, discrete echos. Splitting the audio into four Analog Delay processors as parallel inserts does a fine job of emulating room ambiance.

First, set up the Splitter for four splits, and choose Channel Split for the Split Mode.

Set the controls on the four delays identically except for the four time parameters; turn off Sync and choose 11, 13, 17, and 23 ms. These are prime numbers so they don’t create resonances with each other.

Now use the Channel Editor to create macro knobs for controlling the Mix, Feedback, and High Cut. Assign Knob 1 to the Mix controls on all four delays. Set this to go from minimum to maximum so that if you use this FX Chain as a bus effect, you can set Mix for maximum (no dry signal). Otherwise, when used as an Insert, you’ll likely keep the Mix at 50% or below.

The second knob controls Feedback level. I’ve limited the maximum amount to around 60% for each of the delays. Experiment with this knob depending on the audio source; more feedback gives more diffusion. With percussive instruments like drums, you’ll want more feedback than with sustained instruments.

The third knob controls the amount of High Cut for the delays. Set this so the High Cut doesn’t go much lower than 2.5 kHz.

To hear what this FX Chain can do, load a mono AudioLoop like Guitar > Pop > Dry > 01a Basement Jam E min. Set Mix and Feedback to around 40%, and High Cut to 7 kHz or so. You’ll hear the guitar playing in a room, with a lifelike stereo image.

And don’t forget to save the FX Chain—you’ll likely want to use it again!



  • Brent (Doc)

    Thanks sir !

  • Håkon Christensen

    Where in the chain would this usually go? Before or after Amp?

    Are there any benefits using it as a FX Send?

  • Ken-Arve Nilsen

    Thanks, Craig. Appreciate it, especially coming from you 🙂
    All the best.

  • Robert Pilkington

    amazing too see my favorite effect guru, doing advice like this for my favorite DAW

  • Doc Remedy

    It’s because when the delay is set as a Prime number, the tone that it makes is no longer equally divisible by 2, which even thought it’s technically still making a tone, it has less relation to any harmonic octaves in the rest of the music or mix or other delays. It’s a trick / rule that’s commonly taught, working with Prime Numbers. Using EVEN numbers means that there’s a better chance 2 or more of the delays can share or have harmonics that fit eachother, which clouds it up, too much of the same frequencies. I hope I explained this easily to follow, lol I’m no GURU just a student always learning like the rest of us!

  • Doc Remedy

    this technique was amazing! It can also be played with in conjunction of the Console Shaper to create some cool effects with added Crosstalk and Noise options!

  • Doc Remedy

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  • jr lobbo

    I did everything right and it was very good.

    really enjoyed.


  • Brent (Doc)

    Do you have more info on this ? “choose 11, 13, 17, and 23 ms. These are prime numbers so they don’t create resonances with each other.”, thanks !

  • Bill Patrick

    I just did this. Cool trick and a subtle effect. Great on drums with feedback 100%. Sweet tip on using primes to avoid harmonic resonance!

  • Hilal Mochtar

    Amazing! I will Try it, Thanks

  • Thank you for this tip. Gonna have to use this on future projects. Gonna have some fun with this.

  • Martin Weeks

    Since I don’t have Pro Yet, can’t use this, BUT… I’m building my bookmarks Folder for when I can afford to upgrade from Artist to Pro.
    Don’t suppose there’s a way to duplicate this technique using More Standard Parallel Bussing or Send/Return is there?

  • Correct. This is a way to emulate the sound of room mics, great for people who don’t have extra microphones… or a big room to put them in!

  • Ron Grimm

    so im new to presonus, when you say virtual mics that is in fact virtual not actual physical mics placed in a room right?

  • Roman Clarkson

    Awesome info. In my FX presets now. Keep this info coming.

  • Jorge Araujo


  • Blokheadz

    Is the splitter for those who have the presonus studio one pro?

  • Dean Bibb

    As someone who runs an HD500X via SpDif and a Hartke VLX bass pre I should really get some mileage out of this article. Thanks, Craig!

  • Anderton

    Sorry, Artist doesn’t have a Channel Editor or parallel processing.

  • Anderton

    Hey Ken – great to see you here as well, I always thought your contributions in the Sonar forums were outstanding.

  • Anderton

    The most flexible option is to use it as a send effect. When I use this in a track, it becomes part of the “room sound” so I don’t really think about bypassing it. Hope this helps!

  • Ken-Arve Nilsen

    Nice to see you on this side as well, Craig.
    Cool tip.
    Ken aka Zargg

  • Dmitry Caljkusic

    With Drum Kick interesting looks

  • Sylvain MYSTPF

    Nice, thank you so much…

  • Dannie Caleño

    is the splitter only in S1 professional? i have S1 Artist and cannot find it 🙁

  • jr lobbo


  • Elay Beatz

    Great. Will definitly try this one 👌🏾👌🏾

  • John Maar

    Nice tip! Thanks, CA.

    This FX chain needs some makeup gain. Need to noodle that out.

  • Excellent technique in my favorite DAW! I can’t believe after 30+ years, I’m still learning great stuff like this from you, Craig! You’re still the best!! Thanks.

  • Craig Anderton

    Indeed..I’m very much into parallel effects, and the Splitter makes it easy. I always found the Splitter in Guitar Rig useful, so having it the host program itself is just that much better.

  • Michael Docy

    Thank you. The splitter in Studio One is one of my favorite features.
    Imagine trying to do all that routing with busses or auxes!
    The splitter makes it easy and keeps the project very clean.