However, there seems to be no way of playing any sound to test it out. If I go to options->Audio Device Settings->Test button , it plays a single sound which cannot be controlled.
Don’t use pulseaudio with JUCE hosts. And there is a MIDI Input in internal plugins list.
PS do you have all these outputs connected to speakers? Leave only the real outputs checked, channel 1+2 for example, if you have stereo setup.