Sometimes virtual devices don't show up.

[keinstein]

Hi,

using Mutabor (​http://www.math.tu-dresden.de/~mutabor) I not all Midi ports of the software are shown by patchage. The software connects to other MIDI devices using RtMidi?. When it opens a MIDI device it assigns the name of the port on the other end of the link to the corresponding port e.g.: the port linked to “Midi through” is named “Midi through:0”. Thus, it is easy to establish the correct matchings between ports as named in Mutabor and ports as seen by ALSA (e.g. aconnect or patchage). Unfortunately patchage loses some of the ports. When I connect my Keyboard to the software, patchage only shows the Mutabor output port, which is linked to the input of my keyboard.

The other port is not shown in patchage. When I link mutabor to another device the input port appears sometimes but when I connect the other end of Mutabor to the corresponding device it disappears again.

At the end I find error messeges like

Unable to find port `alsa:132:0:in' to disconnect
Unable to find port `alsa:132:0:in' to destroy
Unable to find port `alsa:132:0:out' to destroy
[ALSA] Attempt to subscribe ports that are already subscribed.
[ALSA] Subscription failed: Das Gerät oder die Ressource ist belegt
Unable to find port `alsa:132:0:out' to destroy
Unable to find port `alsa:132:0:out' to destroy

in the console.

Maybe it's related to some bug one of my friends had: On his computer patchage sometimes attatched some links to the wrong device I don't remember wether outgoning connections were linked to the input port of the software or vice versa (while I'm using ALSA, he used Jack connections).