Peter P:

Hi list,

I am wondering how I could make a VU meter automatically receive all
audio that is sent to specific jack output ports by various
applications, also from those that I will start later on a given day.

thank you for all ideas!

Hi,

jack_capture is able to do exactly what you ask for.

jack_capture is mainly made for recording audio,

but to avoid recording anything, just run it in "timemachine"

mode:

$ jack_capture --meterbridge --timemachine --port system:playback_1 --port system:playback_2

(make sure "meterbridge" is installed)