Hi, I've received a complaint about VMPK not seeing other application's MIDI ports in the internal connections dialog. Among others, it doesn't list LinuxSampler ports. This isn't usually a big problem, because it is still possible to make the subscription using a connection manager like aconnect or qjackctl. Anyway, the problem is that VMPK (using RtMIDI functions) enumerates and filters the existing ALSA sequencer ports in the system having the port type flag SND_SEQ_PORT_TYPE_MIDI_GENERIC, that means "This port understands MIDI messages." according to the alsa library documentation: http://www.alsa-project.org/alsa-doc/alsa-lib/group___seq_port.html#g43e52c… This is the same policy used for instance by aplaymidi, from alsa-utils. If you execute "aplaymidi --list", it doesn't show linuxsampler either. Please: can you add SND_SEQ_PORT_TYPE_MIDI_GENERIC to the sequencer ports of your synths, if the ports understand MIDI messages and are supposed to be subscribed by players or other applications? In addition, there are other interesting flags defined in the ALSA library that could be applied also to LinuxSampler, for instance: SND_SEQ_PORT_TYPE_SYNTHESIZER. http://www.alsa-project.org/alsa-doc/alsa-lib/group___seq_port.html#ge67062… Regards, Pedro