$ rosegarden
kbuildsycoca running...
PluginFactory::instance(ladspa): creating new LADSPAPluginFactory
[/usr/lib/ladspa] 
KCrash: Application 'rosegarden' crashing...
ERROR: KUniqueApplication: Registering failed!
Rosegarden 4-1.0 - AlsaDriver - alsa-lib version 1.0.11

JackDriver::initialiseAudio - JACK sample rate = 44100Hz, buffer size = 1024
JackDriver::initialiseAudio - creating disk thread
JackDriver::initialiseAudio - found 2 JACK physical outputs
JackDriver::initialiseAudio - connecting from "rosegarden:master out L" to "alsa_pcm:playback_1"
JackDriver::initialiseAudio - connecting from "rosegarden:master out R" to "alsa_pcm:playback_2"
JackDriver::initialiseAudio - found 2 JACK physical inputs
JackDriver::initialiseAudio - connecting from "alsa_pcm:capture_1" to "rosegarden:record in 1 L"
JackDriver::initialiseAudio - connecting from "alsa_pcm:capture_2" to "rosegarden:record in 1 R"
JackDriver::initialiseAudio - initialised JACK audio subsystem
KCrash: Application 'rosegardensequencer' crashing...
zombified - calling shutdown handler
ERROR: Communication problem with rosegarden, it probably crashed.