LinuxMusicians

Hi all,

I am very new to Jack and Linux audio in general, so I apologize if my questions are silly. I own a POD HD300, and I would like to use it as a sound card to loopback my guitar sound in the computer speakers...recording would also be nice. The POD gets appropriately recognized by the system and its device driver functions properly. In fact, I can hear sound using Pulse, of course with huge latency. I would like to use Jack for this (already properly installed and set it up for real time scheduling).

I have configured Jack from QJackCtl such that the interface I am using is my POD (interface box in the Setup window). Now, I cannot really go on. I guess I have two options to loop my sound back to the speakers (and please correct me if I am wrong): (1) specifying the input and output device in the Setup window appropriately; (2) specifying a proper connection in the Connections window.

Option 1. The Input Device and Output Device scroll down list in the setup window are only usable if I select Duplex in the Audio scroll down list. And, in any case, they only list the audio cards of my PC, not the speakers. I guess, this is not the right way then. However I have some questions: what are the Input and Outout device scroll down list good for? And why can they only be used with duplex?

Option 2. The POD appears only in the ALSA tab of the Connection window. Therefore I cannot connect it to loopback, which instead appears in the Audio tab. How can I proceed? And, in general, what is the difference between the thre tabs Audio, Midi, and ALSA. Why don't I get the POD in the Audio tab as well as a USB sound card?

Thanks a lot for helping

Best
Cristiano

cristianoale wrote:Option 1. The Input Device and Output Device scroll down list in the setup window are only usable if I select Duplex in the Audio scroll down list. And, in any case, they only list the audio cards of my PC, not the speakers. I guess, this is not the right way then. However I have some questions: what are the Input and Outout device scroll down list good for? And why can they only be used with duplex?

You're doing it all wrong. You don't need to choose the speakers (they surely can't be available in list of soundcards), choose the soundcard which plays through your speakers. Also, I have no idea about what devices do you have in your device lists because it's your computer, not mine. Be a little smarter. Learn the basics of signal routing and provide some screenshots of what you have now, please. Also, you asked about duplex mode. Well, duplex mode means that you can play, monitor and record at the same time and use different devices for capture and playback, respectively. In this case, simplex mode means that you can work only on one device and can't play back what you're recording. Check out Wikipedia if you're still curious about simplex and duplex modes.