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CHAPTER 9 RECORDING AUDIO
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hard disk helps if you intend to record a lot of audio tracks, and newer processors are advantageous when it comes to adding CPU-intensive effects to those tracks, as you read later. Most GNU/Linux distributions have Ardour binary packages available. You also need the JACK (GNU/Linux, Windows Mac) sound server installed to run Ardour (http://jackaudio.org). Unlike Audacity, Ardour relies on JACK for routing audio internally as well as to and from sound hardware and between other applications. As in the last chapter, the use of the qjackctl applet (JACK Control) is highly recommended. In Ubuntu, you can install the ardour, jackd, and qjackctl packages using the Synaptic Package Manager.
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The Real-Time Linux Kernel
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For the best results with Ardour, you need a real-time Linux kernel. It s possible for you to compile your own kernel with real-time patches if you know how, but it s a lot easier to use a ready-built multimedia kernel package for your GNU/Linux distribution of choice. These real-time kernels come as standard in multimedia distributions like 64 Studio (based on Ubuntu), JackLab (based on OpenSUSE), and Ubuntu Studio (based on... er... Ubuntu). To install a real-time kernel on Ubuntu Jaunty, open Synaptic and install the linux-rt package. Then, open a terminal and run the following commands, replacing the example of daniel with your own username: sudo sudo sudo sudo adduser daniel audio su -c 'echo @audio - memlock unlimited >> /etc/security/limits.conf' su -c 'echo @audio - rtprio 99 >> /etc/security/limits.conf' su -c 'echo @audio - nice -10 >> /etc/security/limits.conf'
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The first of these four commands adds your username to the audio group on the system, and the second tells the system not to lock memory when members of the audio group run programs. The last two commands give members of the audio group the ability to run JACK with real-time priority. Now, reboot to run the new kernel by selecting its entry in the GRUB boot manager. This kernel entry has a line ending in -rt, such as Ubuntu 9.04, kernel 2.6.28-3-rt
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Note If you ran JACK while reading the last chapter, without the real-time kernel, then after performing the
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steps just outlined, you can run the JACK Control applet, click the button to open the Setup window, check the Parameters box for Realtime, and uncheck the box for Soft Mode.
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Configuring JACK
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When the ardour, jackd, and qjackctl packages are installed, you need to tweak JACK for your particular system. Just as in the previous chapter, if you re using Ubuntu, it s highly recommended that you remove the pulseaudio package in Synaptic and reboot before running JACK. In theory, the PulseAudio system is compatible with JACK; but in practice, running both sound servers at the same time can lead to problems, including extraneous noise in recordings. Close any programs that may be using the soundcard, and run the JACK Control applet from the Sound & Video menu. If you haven t run JACK before, click the Setup button on the right side of the JACK
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CHAPTER 9 RECORDING AUDIO
Control applet, and look at the settings available (see Figure 9-22). If you already ran JACK while working your way through the last chapter, it s a good idea to take another, closer look at the options before running Ardour. For your purposes, the most important settings are as follows:
Figure 9-22. These are good initial jackd settings for a modern PC with a standard (non-real-time) Linux kernel and a USB sound device. Parameters Realtime: This check box, on the left side of the Setup window, should be checked if you have a real-time kernel running and you ve made the tweaks to the system s audio group suggested previously. It enables the jackd daemon to obtain real-time privileges, which is to say that audio becomes the machine s most important task. You can run jackd without these privileges, but audio streams may be interrupted, causing a buffer under-run (which jackd calls an xrun). These xruns are heard as glitches in the recording, which is something you want to avoid, of course. Frames/Period: This setting, in the middle column, determines the size of the buffer (and therefore the audible latency of the system). A big buffer is safer; but the bigger it gets, the worse latency will be. In an audio context, latency is the time that elapses between the moment when the computer does something and the moment you hear the associated sound. Musicians with well-trained ears can hear latencies of 10 milliseconds or less, which can upset their timing. On a modern machine with a real-time Linux kernel, 256 is a reasonable Frames/Period setting to start with. If you see xruns, set this to a higher number; if your PC is old and slow, you may need to go as high as 1024. Watch the figure in the Latency box (lower-right corner) change as you adjust the Frames/Period setting.
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