I'm running a reasonably fresh Fedora 29, XFCE desktop, I'm in the audio group, and Jack2 is running.
The application menu shortcut does nothing, so I've also tried running the calf GUI from the terminal, but "calf -v -a" just produces an output that appears nonsensical to me:
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Usage: calf [-v] [-a] [-n] [-p <projdir>] [-c <cname>] [-<i>] <libname>[:<label>] [...] -v Verbose mode -a Don't autoconnect outputs to JACK physical outputs -n Don't automatically start plugin GUIs <projdir> Project directory to pass to plugin and UI <cname> Client name to use for ALSA and JACK <i> Number of instances of each plugin to run (max 16 total, default 1) <libname> DSSI plugin library .so to load (searched for in $DSSI_PATH) <label> Label of plugin to load from library [...] Optionally more instance counts, plugins and labels Example: calf -2 lib1.so -1 lib2.so:fuzzy run two instances of the first plugin found in lib1.so, assigned to MIDI channels 0 and 1 and connected to the first available JACK outputs, and one instance of the "fuzzy" plugin in lib2.so with MIDI channels 2 and 3 and connected to the next available JACK outputs. As a special case, if this program is started with a name other than jack-dssi-host, and if that name (plus .so suffix) can be found in the DSSI path as a valid plugin library, and if no further command line arguments are given, then the first plugin in that library will be loaded automatically. [lech@localhost ~]$ calf -1 lib1.so calf: Error: Failed to load plugin library "lib1.so" [lech@localhost ~]$ calf -v -a calf: No plugin specified
Does anybody have any ideas for getting some working filters in a GUI environment?