How to Create a Synthetic Drum Sound out of Acoustic Drums with FilterFreak

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A tutorial on using SoundToys FilterFreak to create a more synthetic sampled sound out of an acoustic drum recording.


Hey, folks! Matthew Weiss here. Www.weiss-sound.com, www.theproaudiofiles.com.

We’re going to be doing a little bit of sound design. This is something where if you were the mix engineer and you did not do the production, you want to try and look at this as something to do with extreme caution, because you’re going to radically change the sound of the drums in doing this, and a lot of times, people are very deliberate about their drum sounds.

However, if you’re the producer, or somebody is coming to you looking for that production edge, this can be a really cool technique for turning an acoustic drum sound into essentially the sound of a drum sample, or a drum machine drum, but still retaining the feel of acoustic drums.


I’m going to activate FilterFreak from SoundToys.

[drums with FilterFreak engaged]

So now the other thing we’re going to want is that low-end oomph. So, for that, I’m going to set a low-pass filter, and I’m going to turn the frequency back up.

[snare drum plays]

So, that’s giving me that body of the snare right there. I think that it’s a little bit too much in the low-end, so I’m going to turn the gain down.

And then the last thing I can do here, there’s a couple other little controls that I can play with if I want to.

There’s this mix knob, where if I want to retain some of the original acoustic drum sample, I can blend it in.

[snare drum]

That kind of has a cool sound. It has a little bit of a phasey sound. I’m not so sure I dig that much of it, so I’m going to set it all the way wet here.

Then the other thing that I can do is this modulation control – modulation is movement of the filters up and down the frequency spectrum. When it happens very quickly, it becomes basically a texture control, and when I say very quickly, I mean the entire duration of a drum hit is maybe about 20-80ms. That’s pretty quick. So, the filters are moving very fast, and what happens is you get this kind of phase distortion, this modulation distortion that happens, and it’s basically a texture control which you can choose to have or dismiss if you don’t want it.

[snare plays]

So, that’s something that’s there. For this kind of thing, I usually don’t use too much of the modulation, if any. I have a preset that I’ve saved called “Snare Synth Maker.” It sounds like this.

[snare drum]

So, that’s a little bit more digital sounding. It’s a little bit more artificial, but it’s a cool sound. So I like that.

The kick basically has something similar going on here where I’m emphasizing the very very low sub frequency, which is probably somewhere around 60Hz, and then just the very treble of the frequency. So what originally sounded like this…

[kick drum]

Now sounds like this.

[kick plays, FilterFreak engaged]

And you’ll notice that I am using a little bit of the mix knob here. It’s blending in some of the original kick and keeping that texture.

Now, another thing we can do, is we can use that sort of same idea if you have two mics on the kick drum…


…We can use one instance of FilterFreak on one, and we can actually use a different instance on the other.

[kick drum, swapping between kick in and out]

And that’s a pretty cool sounding drum machine little drum. The way that it works is the bottom mic here, which is a U48 on the outside of the kick, really plays up both the low end and the high end of the kick sound, but it doesn’t really have too much of that knocky mid. So I’m really exaggerating all of that with this instance of FilterFreak. I’m really exaggerating the sub, I’m exaggerating the treble, I’m eliminating the knock tone that would live in the mid.

But, with this other mic, which is a Sennheiser on the beater side of the kick, I’m eliminating everything except for that knocky tone, and I’m blending the two together to get something that has a really cool, punchy, very artificial sound, but it’s compelling and it works.

[drums play, switching between processed and original sounds]

Now, again, the drum texture here has completely changed. I basically changed the entire drum sound. So, if I’m going to do this, I have to pick and choose where this is going to be most appropriate.

But, that said, if it is something that I want to do, it’s a tool that I have in my arsenal, it can be really effective, and I actually think that it sounds really good.

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