It doesn't quite work like that on my system.
I tried this:
1. Reboot the system for a clean start.
2. Start an audio stream from JRiver, the convolver GUI pops up, and stays open.
3. Select "Only tray icon" and press "Save". This is where it goes haywire, as a volume slider pops up and stays on the screen. (I have locked the volume control at 0dB, as we adjust volume from JRiver)
4. Reboot the system, for another clean start.
5. Start an audio stream and this happens:
photos.app.goo.gl
6. I am unable to get a stream to play, and unable to open the convolver GUI. Stopping the stream, makes the convolver tray dissapear.
7. To get into the convolver settings, to change them, I have to open the stand alone convolver, change settings press "Save" and reboot.
8. After a new reboot, there is no convolver icon, until I play a stream (I guess this is intentional)
9. Starting a stream from JRiver, this happens. Note: I have not started the stand alone convolver here, it is right after a reboot. The volume slider pops up in an oversized window, but I hear no audio although JRiver is playing.
10. The tray icon is there, and I can now open the GUI via the tray icon. Here I can see that audio is muted. I unmute and I have audio coming through.
11. I close the convolver window.
12. Stop the JRiver stream.
13. Start a new JRiver stream.
14. The convolver window pops up again, and stays open.
15. Close the window.
16. Stop the stream.
17. Start the stream.
18. Convolver GUI pops up again. It does not remember wether it was open or closed, on my system.
19. This is a video of it, and I have not started the stand alone convolver after the reboot:
photos.app.goo.gl
Something is really acting up, in a not so nice way. Let me know what I can do to debug further, as this is something we cannot live with on a smartphone operated mediacenter.