Giada: Hard-Core Live Looping
Live DJs chasing a simplistic but attractive application are going to love Giada. At the same time, Giada also covers something I've been wanting for a year now, which is a way to trigger individual samples from a computer keyboard simply in real time. According to the documentation:
Giada is a free, minimal, hard-core audio tool for DJs and live performers. Load up to 32 samples, choose to play them in single mode (drum machine) or loop mode (sequencer), and start the show with your computer keyboard as a controller. Giada aims to be a compact and portable virtual device for Linux and Windows for production use and live sets.
The Giada hard-core looping program for real-time DJ performances with a GUI that's sleekly minimal.
Giada in its full-flight recording mode lets you layer a live performance piece by piece.
Using Giada is pretty easy, but its ease of use comes at a price. It's a freeware binary. This is the first freeware program I've covered, but don't worry, I won't make a habit of it.
The project's Web site consists of a (well-designed) single page, with download links for both the Windows and Linux versions of Giada.
As far as library requirements go, the documentation states:
Giada is based upon RtAudio and FLTK (GUI). They are both statically linked, but the former needs libjack.so to provide JACK's features. In a modern Linux-based OS, you should be able to run Giada without any further installation or hack.
Regarding binaries, the manual also noted: "This software is compiled for x86 processors; we still don't know what happens if you run it under a 64-bit OS/environment; try it and tell us your experience." Yes, I'm on 64-bit Linux, and it runs just fine.
Once you have the dependencies out of the way, download the latest tarball and extract it. Personally, I found I could just open the new folder, click on the binary, and it worked. For those wanting more control, open a terminal in the new folder, and enter the command:
Once you're inside, using Giada is actually pretty easy. Although I was rather confused at first glance, a quick bit of "RTFM" shows that its methodology is very basic, but you need to understand a few things from the outset.
First, this isn't for programming songs over some sort of grid, such as the way that programs like Fruity Loops operate. Giada is for playing live. All of your actions take place in real time, as you perform what is essentially a live DJ set (even if it's only in your bedroom to an audience of one). So trust me, you'll want to practice before using it in public.
Second, Giada is designed to be run by your keyboard, and by that I mean the thing on which you type, and not something that resembles a piano.
Before I explain the three modes of operation, let's first load some samples so we have something to play with. In terms of format, Giada likes only 44KHz .wav files. A good starting point is Hydrogen's drumkits. If you have Hydrogen installed (and if you don't, at least install the drumkits), look for .wavs under /usr/share/hydrogen/data/drumkits. Kicks, snares and a cymbal or two—hi-hats in particular—are the best starting point. With these, you can lay down a basic beat and then layer other samples over the top to make a song.
To load these samples, click on the long and wide buttons that say, "-- no sample --", and choose your .wav file from the file browser. Now, if you look to the left of each sample, a keyboard character is shown; with this, you switch samples on and off. Try pressing it now, and nothing will play, but fear not. I discuss Giada's three running modes below, and it all will make sense.
Oneshot mode: this is the most basic way of operating Giada. Press a keyboard button, and that button's sample will play. However, first you must turn on this mode, as well as turn up this sample's volume. Starting with the volume, the empty circle to the immediate right is actually a volume knob. Clicking and dragging inside the circle turns up the volume. However, unless you've pressed the Play button, there still will be no sound; you have to enable Oneshot mode.
The next control to the right, with the small circle inside the square, is the key to operating Giada. Click the button, and you'll have a choice of looping modes, or Oneshot "basic", "press" and "retrig". Choose basic, press the key, and at last, a sound plays!
With this basic mode, you press a key and a sample plays until it's finished—pretty basic. But, you also can interrupt the sample by pressing the key again. With the "press" option, you have to hold down the key to play the sample, and as soon as you release it, the sample stops. The "retrig" option (and this is the functionality I've been chasing) plays a sample upon pressing a key, but pressing again restarts the sample whether or not the sample has finished. You even can keep thrashing away at the key for instant response, which is handy for playing hi-hat notes or ripping up a waveform.
Loop mode: this is the second mode, and perhaps the most conventional. When Giada is actually playing, choosing either "Loop . basic" or "Loop . once" plays a sample on the next bar along. In order to use this, press the Play button near the top-left corner, then press each sample's button to activate/deactivate it on the next bar. The "basic" option simply keeps the sample looping until you turn it off manually; the "once" option plays a sample until it's finished, and then starts it again at the beginning of the next bar.
Recording mode: this is the pièce de résistance. Basic loops can be turned on and off willy-nilly; however, the Oneshot samples start turning this into a real live performance. As the bar moves along each of its counts, every time you play a note, that note is repeated every bar that follows. Using this method, you genuinely can layer an entire song, creating new beats on the fly. Be wary, however. Every note you play is a commitment, and you'll be stuck with that note repeating for the rest of the song. Get it right, and you'll have people dancing. Get it wrong, and you'll look totally lame and ruin the party.
Nevertheless, some tools are available to help out the mere mortals among us. The beat bar will be immediately obvious, because it's the only moving thing on screen. Use this and its (default) four boxes to guide your counting. Over to the right, the box that's marked "off" is for quantizing your music. For the uninitiated, this aligns your notes to even places on a musical grid, removing the element of human error: "1b" is the most severe, making each note land on a whole count; "8b" is the least severe, allowing you to make much more intricate music.
If you look farther right, you'll see a tempo and beat number, set to a default BPM of 120 and a time signature of 4/4. You can turn these up or down, allowing for strange feels, such as 7/4 @ 72 BPM (less dance-friendly, but much more trippy).
Still, this early software does have its limitations. First, it's freeware. In this day and age? Why? Ech! Second, there weren't any panning controls as far as I could tell. Any stereo imaging you'll have to do beforehand, manually.
Nevertheless, this program is incredibly cool. It allows you to output to JACK, which makes it more powerful, and just look at it. It's a techno-minimalist's wet dream! Giada has an amazing economy of space and features in its design that's quite deceptive. I actually thought this was going to be a very short review when I started. Giada is a must-have for any electronic musician.
John Knight is the New Projects columnist for Linux Journal.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.Register Now!
- Tech Tip: Really Simple HTTP Server with Python
- SUSE LLC's SUSE Manager
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- My +1 Sword of Productivity
- Managing Linux Using Puppet
- Non-Linux FOSS: Caffeine!
- Returning Values from Bash Functions
- Doing for User Space What We Did for Kernel Space
- Rogue Wave Software's Zend Server
- Parsing an RSS News Feed with a Bash Script
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide