Document on using Jack Apps

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Hello:

I am very much new to Linux and Linux audio.  I am trying to measure audio IO latency for my system.
Jdelay seems to be the right tool but when I run it on the terminal, I am getting message "Signal below threshold..." which probably might be because Jack is trying to capture audio and ends up getting the low noise floor because I do not have meaningful signal source connected.  But then I tried to patch the this App to the qJACKctl app but the settings console is not straight forward to interpret. as it involved many parameters.

I guess there are # of frames per period that may eventually be used to calculate the target latency but is there a step-by step document description for Jdelay and any other JACK tools and also using JACK audio server in an effective manner?  Also, qJACKctl console does not offer options for very low sampling rates like 8 KHz.  With ALSA, this should be possible but may be this particular tool does not support it.  Can anyone help here?

Thanks,
-F
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