Are you a World Cup fan annoyed by the constant sound of the South African vuvuzela horn? Wish you could remove that sound from your World Cup viewing experience? Do you want to learn a little bit about powerful modular effects routing can be on Linux? Either? Both? Call it “football”? “Soccer”? Any way round, we’ve got you covered.

(Disclaimer: I have nothing in particular against the vuvuzela. But here you go, anyway.)

Updated: Via comments, here’s a Mac plug-in for filtering the horn, also a notch filter, and a sign that this is getting a little carried away. (Mostly, I think this is a useful way to learn about JACK, something you can use after the World Cup. But knowing football fans, “after the World Cup” may not be a phrase with any meaning at the moment.)

JACK is a powerful audio API on Linux, and thanks to rich application support for the tool, you can route sound arbitrarily between software tools, making everything on your computer into a kind of virtual studio. (Mac users should check out the excellent JACK OS X implementation.)

Felix Kaechele, a German-based Fedora community member and Fedora Ambassador, uses JACK to filter out sound from his live World Cup feed. If you’re curious about how JACK works and how to add effects to your system (or record a system audio feed, etc.), this is the way to go. The trick here is that PulseAudio, the default sound API on Linux, actually gets routed right into JACK.

Read the full instructions here:
Vuvuzela Filter using Fedora [Felix' Blog]

Fedora is a superb distribution, and intelligent JACK packaging is a particular strong suit. (Check out the Planet CCRMA project for more.) But part of the strength of Linux is that it is open, so you’ll find these same instructions work on other distributions. In fact, so long as you replace “yum install” with “apt-get install”, you’ll find most of these packages have the same name. (Only “ladspa-swh-plugins” is missing on Ubuntu, though there are other LADSPA plugs available.)

Note that on vanilla Ubuntu, I did need to do one extra step when setting up JACK. When you launch, JACK will actually advise you to do so right in the message window, but here it is, as a reminder:

Please check your /etc/security/limits.conf for the following lines
and correct/add them:
@audio – rtprio 100
@audio – nice -10
After applying these changes, please re-login in order for them to take effect.

These steps tweak real-time performance for better JACK sound results.

Also, I generally like to launch JACK Control with the following command, in order to disable PulseAudio:
pasuspender qjackctl

But in this event, you’d actually install the Pulse module and route Pulse into JACK, as in the instructions.

Setting up Ubuntu is a topic for another article, but there’s a preview. But the musical applications here should be clear: JACK makes it easy to set up a modular rig. Want to add effects to a Pd patch? Record audio from a system application for sampling? Route together some effects to make a virtual stompbox rig for your guitar? Having JACK is a bit like having an extensive patch bay for software.

Let us know how these tips work out for you, or if you’ve got ideas of your own. (And if someone wants to do a Mac version of the tutorial, let us know!)

Via OSTATIC; thanks, Brad Linder!

iproducer #4 – Unlink and Conquer + Bonus from Gustavo Bravetti on Vimeo.

Exclusive to CDM (and Vimeo), Live guru Gustavo Bravetti offers a deep tutorial in sound creation in Ableton using “unlinked envelopes.” He assembles quasi-modular routings of effects into one another to create some unusual sounds. I think there are some inspiring techniques here, even beyond Ableton Live – I’d watch it even if I weren’t a Live user.

Gustavo writes:

“This workshop demo video is about using Live’s unique clip unlinked envelopes and Ableton’s effects to easily create elaborated sequenced sounds as well as a “how to” create a bass, a tuned bass drum, a clap and hi hats.”

So, what’s the beauty of the “unlinked envelope”? By separating the envelope length from the length of a sample, you can take a sample of one length and modulate it in time independently with an envelope of a different length. A short sample can warp in a longer block of time for more variety – a 1/16th note sample, for instance, transformed over a bar or two. Add the ability to route the envelope into effect modulation, and you can start to think extreme sonic freakiness. Here, that serves Gustavo’s own electronic palette, but it could suit a variety of musical aims.

You can also go the opposite direction: you could take a long sample and modulate it with a short envelope. For instance, you could select a 30-second oscillating texture, and apply a very short envelope, like a single sixteenth-note peak, in order to create an evolving high hat.

You can think of the unlinked envelope as a modulation source for a variety of sonic targets. It could be a short sample, a chain of effects, or a synth. Here, Gustavo sticks to built-in Live devices, but you could easily add your own plug-ins of choice – especially now that Live has added the ability to more easily choose which third-party plug-in parameters you wish to target.

Part of why I say this is about more than just Live is that you can begin to see how thinking in envelopes can make your musical content more dynamic, a technique you can apply to any environment that allows this sort of routing. It certainly illustrates the power of Live in a way that I think a lot of people miss.

To watch the full HD version, head to Gustavo’s Vimeo account.

I’m going to be organizing a compendium of our best Live tutorials soon; if you have external tutorials you’d like us to link up, let us know.

Previous Gustavo-fueled mayhem:
Ableton Live Follow Actions, Dummy Clips, Making Snares
DIY 808, IDM 101
Gustavo Bravetti Show Us How To Glitch out Ableton Live
Hexagonal Sequencer with vvvv, MIDI, Ableton, and Soon Wii, Camera Input
Live + FM8 = Drum Kit Love: Free FM8 Drum Kit Download

Ableton forum members are abuzz on this latest hack for Ableton Live: a specialized plug-in now enables a “bus group” that routes audio to a MIDI track for effects. Now, of course, group folders are a feature present in some competing DAWs, but it’s still nice to see it working in Ableton Live. (And if this is something you’ve wanted to do, I think you’ll probably spot it immediately – whereas, likewise, if it’s not your response is likely to be, “huh”?)

There’s already a free Windows plug-in download. It looks like someone will have to do a Mac plug-in for this to work on the Mac. Thoughts?

gbsr writes:

Basically, it’s a way to get an infinite (or at least until your CPU gives up) [number of] submix track folders, with the ability to show/hide the folders. Take a VST instrument that only has a MIDI input and an audio throughput and rack it up. Send the audio to the midi. Voila.

You can read the whole thread on the Ableton forum:

solved: submix group folders.

Let us know if you try this out or have other tips. (And if you do this already in another host, by all means, enjoy your bragging rights.)

plasq, the wonderful people who brought us Skitch and Comic Life, have been giving their audio tools new lives rather than orphaning them. We’ve already seen plasq’s live performance-savvy instrument and effects host Rax show up as an Audiofile Engineering product, and AE in turn recently promised in comments that great things were coming for Rax.

Now, we have some great news for Wormhole2: it’s gone open source:

Wormhole2 @ Google Code

Product Page and Features (still up at press time)

Discussion at plasq.com Forum

End users can just download AU (Mac) and VST (Windows) binaries, plus a PDF manual. It’s even a Universal Binary for Intel Macs.

Developers: because VST isn’t an open-source format, you have to download Steinberg’s VST SDK to use it, but plasq will actually go the trouble of sending you the files once you agree to Steinberg’s license agreement. (AU isn’t either, but Apple ships all the developer tools you need with the OS.)

I’m really hopeful someone will build something cool with this. You’ll need something else to route MIDI (though the Mac does that over networks out of the box, cough, Windows). But there are powerful audio-over-network options here which would be hard to work out on your own. It’s unclear how useful Wormhole2 will be to the existing, open source JACK audio project, which is also capable of routing audio between apps and (via netjack) networked computers. JACK uses a client/server model as opposed to Wormhole’s plug-in approach. But for end users, having both tools available free is a very good thing, and the price tag is an extra incentive to be brave and see if these tools can help power up your rig.

There’s something to be said for making connections in hardware studios: if you’ve got the cables, you can make it happen. In the world of the computer, it’s another story. The vision of Jack is to make routing audio between software as flexible. As the creators put it:

Have you ever wanted to take the audio output of one piece of software and send it to another? How about taking the output of that same program and send it to two others, then record the result in the first program? If so, JACK may be what you’ve been looking for.

Previously, Jack lived primarily on Linux and Mac. But Stéphane Letz’s brilliant jackdmp implementation, which fully supports multiple processors (among other things), is now available on Windows, via Stéphane’s hard work. Even the Qjackctl graphical front end gets a port, thanks to Rui Nuno Capela. With all three platforms supported, it’ll be interesting to see what’s next — perhaps more development of netjack, the over-the-network rendition of the idea.

I think it’s also worth mentioning, after all Microsoft’s puffery about “innovation” for musicians in Vista, here’s something genuinely innovative and practically useful for XP and Vista alike. That’s not just to take a slam at Microsoft, either. I hope that these larger companies (all of them) will start to take notice of the value of some of these independent efforts of developers for the larger good. (Developers! Developers! Developers!) For OS development, it means better document your APIs. Be public about changes, earlier and wider. And install these tools, use, and test them.

jackdmp project, background, and details, for all three platforms