![]() ![]() I run Linux Mint this is the set I had to install. To build it, you’ll need qt5 and some assorted libraries and header packages. In Ubuntu and derivatives, the package names are ‘jackd’ and ‘jack-rack’. You should be able to find JACK in your package manager 2, along with Jack Rack. hw:Loopback,1,3: a hardware device, card name Loopback, device ID 1, sub-device ID 3.įor the loopback device, anything input to device ID 1 and a given sub-device ID n (that is, hw:Loopback,1, n) will be available as output on hw:Loopback,0, n, and vice versa.hw:1,0: a hardware device, card ID 1, device ID 0.Optionally, there may be another comma and a subdevice number. ALSA devices are named by a type string (such as ‘hw’), followed by a colon, then a name or number identifying the audio card, a comma, and the device number inside the card. The loopback device is very straightforward: any input to a certain loopback device will be available as output on a different loopback device. Verify that the loopback device is present by checking for it in the output of aplay -l. All you need to do is # modprobe snd-aloop and you’re good to go. The ALSA loopback device is a feature of the kernel module snd-aloop. We’ll also look at some extended and improved uses, including some potential fixes for real-time monitoring. Use QJackCtl to connect the devices so that we can record both microphones at once.Use JACK’s alsa_in and alsa_out clients to give JACK access to the microphones and the loopback device.(This step is optional, but makes things much easier I won’t be providing the how-to for using the command line.) ![]() Build QJackCtl, a little application used to control JACK.Create an ALSA loopback device using the snd-aloop kernel module.Depending on the particulars of your system, you may even be able to set up real-time monitoring. These instructions should work for any modern Linux flavor. Now that you have the background, here’s what we’re going to do to connect two mono USB microphones to one computer, then send them to one two-channel ALSA device, then record in Audacity. It has fewer easily accessible features, but allows us to do some fancy footwork in how we connect inputs to outputs. JACK is a low-latency audio server that is, a user-level application in the same vein as Pulse. ![]() The most common user-level application is the PulseAudio server, which provides many of the capabilities you think of as part of your sound system, such as volume per application and the ‘sound’ control panel in your Linux flavor of choice. It handles interacting with your sound card, and provides an API to user-level applications. Closest to the hardware is ALSA, the kernel-level Advanced Linux Sound Architecture. If you use Ubuntu or Mint, or most other common distributions, there are two layers to your system’s audio. Fifth, we need the QJackCtl program.īefore I describe what we’re going to do, I ought to provide a quick refresher in Linux audio infrastructure. (If your Linux has ALSA, you probably already have this.) Fourth, we need JACK, the Linux low-latency audio server. Third, we need the snd-aloop kernel module. Second, we need a computer with at least two USB ports. I have a Blue Snowball and a CAD Audio U37, with which I’ve tested this procedure 1. First, obviously, we need two microphones. Modern Linux, fortunately, can help us out here.
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