filtrr - free & useful filter plugin

Tutorial | Apr 21, 2025

In this video, I dive into the free Filter plugin by blepfx, exploring its features, including various filter modes, modulation options, and its unique interface controls like middle mouse button clicks. I demonstrate its sound capabilities and how it can be used in a music production setup, noting its integration with Bitwig. I encourage viewers to try it out, highlighting its versatility and recommending other free plugins from the developer.

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• Download the plugin

Summary #

Maybe you don't watch the video, here are some important takeaways:

Hey everyone, welcome back to the channel! Today, I'm diving into an awesome plugin called filtrr by blepfx. It's developed by what seems to be a solo developer, and the best part? It's completely free! You can get it as both a CLAP and VST3 plugin.

At first glance, it might look like just a simple filter on a re-space line, but there's a lot more to it with tons of great details. Let me walk you through it.

First off, it features a low pass filter with a nice visual interface, allowing you to see the pre- and post-frequency curve. You can easily manipulate the filter by grabbing the dot to adjust the quality factor, gain, and frequency position. Double-clicking resets it to default.

You have various filter modes to choose from, like clean, subtle, heavy, warm, fast, chew, and fold. Each mode provides a different sound. Unique to this plugin, you can use right-clicks and middle mouse button clicks for additional options—a feature I haven't seen in many plugins.

The plugin also offers several extra features, such as mixing in the dry signal, changing oversampling, and selecting the filter application to stereo, left, right, mid, or side channels. Plus, there's a built-in limiter to prevent any drastic frequency changes.

Modulation is another powerful feature here. You can use audio rate modulation or select different LFO shapes like triangle and square. There's also a side chain envelope option. You can right-click and drag to modulate, including the quality factor, not just the frequency. A double right-click removes modulation easily.

The interface is top-notch and resizable, which is impressive for a free plugin. You'll find yourself wanting to download all their products after trying this one. Speaking of which, you can switch between different filter types like high pass, low pass, and band pass. Unfortunately, I haven't located a notch filter yet.

Holding the control key allows you to morph between modes smoothly. I demonstrated several modes, showing how they alter the overtones. Additionally, if you're using Bitwig, you can integrate modulation for even more versatility.

The plugin also features in side-channel manipulation and showcases lots of creative applications. Did I mention it's entirely free? I'll drop the link in the description. They also have other plugins like Prisma, Destructor, Cruncher, Digital Decorator, and a spectral compressor, all apparently based on a Rust framework.

I even created a little something using this framework—a simple normalizer tool. Hit the button, it analyzes the signal, and bam! It's at 0 dB. Planning to release it soon for free, too.

So, definitely give Filter by blepfx a try. It's a freebie you don't want to miss. Let me know what you think in the comments. Thanks for watching, and I'll see you in the next video! Bye!

Transcription #

This is what im talking about in this video. The text is transcribed by AI, so it might not be perfect. If you find any mistakes, please let me know.
You can also click on the timestamps to jump to the right part of the video, which should be helpful.

[00:00:00] Yo folks, welcome back to another video, today we are going to look into this plug-in here
[00:00:05] called filtrr by blepfx and I think it's just one developer.
[00:00:09] And this plug-in is completely free and it's available as a CLAP plug-in and also VST3.
[00:00:15] But this one here, it looks like it's just a filter right here, in this case here it's
[00:00:19] on a re-space line.
[00:00:22] So at the first glance, it looks like it's just a filter, but there's a lot of stuff
[00:00:31] to it, a lot of details and I really like how it works.
[00:00:36] So first foremost, we have here a low pass filter with a nice visual in the background,
[00:00:42] so you can see the post and the, you know, the pre-frequency curve.
[00:00:48] You can just grab here this dot and you can increase the quality factor and also here
[00:00:54] the gain and the frequency position and so on, right?
[00:00:59] You can double-click on it and it resets then to, you know, to the right position or the
[00:01:06] default position.
[00:01:07] We also have your different modes for the filter, so we have clean, subtle, heavy, warm, fast,
[00:01:15] chew, fold and so on, right?
[00:01:17] And it all gives you a different sound to the filter and I show you this here in a minute.
[00:01:23] We also can do right-clicks on different dots and also middle mouse button clicks.
[00:01:30] I never saw this actually plug-in doing this or if you know any plug-in that uses the middle
[00:01:36] mouse button, let me know.
[00:01:37] So if you click here with the middle mouse button on this, you get some kind of menu
[00:01:43] you can choose from.
[00:01:45] You can also just normally click on it or you can click and drag to change the modes.
[00:01:52] Also here you can middle mouse button click on this and you can see all the options.
[00:01:58] Then we have here extra things.
[00:02:01] We can mix in the dry signal.
[00:02:04] We can change the oversampling.
[00:02:07] We can also change if you just want to have the filter on the stereo or on the left channel,
[00:02:13] on the right channel, mid-channel, side channel, stuff like this.
[00:02:17] We have a limiter at the end.
[00:02:19] If you want to apply a limiter or you want to have here no drastic changes to the frequency
[00:02:24] spectrum, you can just apply a limiter.
[00:02:26] It's pretty dope.
[00:02:27] I have to say I really like it.
[00:02:30] There's also modulation in here and you can not only use the audio signal as a modulation
[00:02:36] source, so audio rate modulation.
[00:02:38] You can also choose here a triangle, square, some shapes, right, LFO shapes.
[00:02:42] You can also use the side chain envelope input.
[00:02:47] So let's use your sign pretty simple and we have a filter on here and then all you have
[00:02:53] to do is you have to right click and drag, right, something like this and then you can
[00:02:58] modulate in different directions and also, by the way, at the same time, modulate the
[00:03:04] quality factor.
[00:03:05] not only the frequency itself, right.
[00:03:30] So it's pretty interesting.
[00:03:33] So double click here or a double right click on the start actually removes the modulation.
[00:03:40] You can track it out.
[00:03:42] Double click, right?
[00:03:43] Double click.
[00:03:44] Gone.
[00:03:45] It's pretty dope.
[00:03:46] So interface top notch, in my opinion, if I ask me, can also resize this here.
[00:03:50] Of course, it works perfectly.
[00:03:53] For free plug-in, you know, I'm hooked.
[00:03:56] I actually want to buy all the other plug-ins immediately.
[00:04:01] So I also recommend this, of course.
[00:04:05] So anyway, so we can switch here to different filter types, high pass, low pass, band pass.
[00:04:13] So actually, I'm not sure if there is some kind of notch, I haven't found it.
[00:04:21] Maybe there's a notch filter at some point here.
[00:04:24] I haven't figured this out.
[00:04:25] So we can only switch it between the different types.
[00:04:28] We can also hold down the control key and then slowly morph between all the modes.
[00:04:38] Oh, yeah, let's try out here the different modes and show you how it works.
[00:05:08] I'll show you how the overtones sound like.
[00:05:15] So this is clean.
[00:05:35] Let's go down with this.
[00:06:03] So all these filter modes and types sound differently and have different sounds.
[00:06:11] And I kind of like it.
[00:06:14] So you can also use your Bitwig for modulating things.
[00:06:20] So if you want to modulate the filter, morph, or type, fade, whatever you want to call it,
[00:06:28] you can also do this here from Bitwig.
[00:06:30] So just attach here an LFO and it works pretty as you expected.
[00:06:51] Let's put this actually only on the side channel.
[00:06:55] I'm not sure if there's actually a site information there.
[00:07:09] Yeah, let's remove this here for a moment and let's go to iPod.
[00:07:21] That's only on the side.
[00:07:23] So there are lots of things you can do just with this plugin, as I said, this is completely
[00:07:27] free.
[00:07:28] I put you a link in the description below.
[00:07:29] They also make here this Prisma, which is something like Chroma or Pitchmap or whatever
[00:07:38] the name is, Destructor is also free, Cruncher, I think this is probably something like mp3
[00:07:47] codec simulator, I guess, Digital Decorator.
[00:07:53] And I also read that, where is it here, Fax, yeah.
[00:08:00] I think this is based on, I read somewhere that it's based on this framework from Robert
[00:08:11] Poole makes a job bridge and also the spectral compressor here, this one, it's on the same
[00:08:21] framework, Rust framework.
[00:08:25] And I also created some kind of plug in here for me, for myself, just a normalizer is we
[00:08:33] hit the button, right, and analyzes the signal and then it makes it 0 dB.
[00:08:39] I probably release this here pretty soonish also for free.
[00:08:44] It's also based on this framework, but this is here graphically GUI wise, it's on a completely
[00:08:53] different level.
[00:08:54] So I encourage you to download this, try this out, it's completely free, link is in the
[00:08:58] description below.
[00:08:59] Yeah, let me know what you think and thanks for watching.
[00:09:04] See you in the next video.
[00:09:05] Bye.