[linux-audio-user] Please explain Alsa Interface MIDI numbering PLEASE!

Hi, I'm having a great deal of confusion about how Alsa is handling my MIDI hardware. This is spilling over into unintended consequences in Rosegarden that I think none of us understand. Couple someone with some background in this please explain? Thanks. I have two 2-port MIDI devices on this system. One is an RME HDSP 9652 with two MIDI ports, and the other is a hot pluggable MidiSport 2x2. I attach two screen shots of kaconnect, one with and one without the 2x2 plugged in. My questions: 1) In the screen shot "without_2x2.png" I see two read ports and two write ports. Please explain why they are called 64:0 External MIDI 0 64:32 External MIDI 0 Why is my HDSP given the apparent name '64'? Why the :0 and :32? I would have thought :0 and :16 would make more sense from a channel numbering point of view, or :0 and :1 from an interface point of view. What's going on? 2) In the screen shot "with_2x2.png" I've plugged in the MidiSport 2x2. New devices show up in kaconnect. However, instead of showing 2 read ports and 2 write ports, I am getting 4 read ports and no write ports. Please explain why the MidiSport is given the names 72:0 External MIDI 1 72:1 External MIDI 1 72:2 External MIDI 1 72:3 External MIDI 1 Shouldn't this be just :0 and :1 for both the read and write ports? I get the feeling that BOTH of the drivers for these devices are hosed. What's up with these things? I do not understand why Alsa gives these devices numbers in the first place, nor how the numbers are assigned. How can I change the names that are displayed so that "64:0 External MIDI 0" shows the name "HDSP 9652 Port 1" "64:32 External MIDI 0" shows the name "HDSP 9652 Port 2" "72:0 External MIDI 1" shows the name "MidiSport 2x2 Port A" "72:1 External MIDI 1" shows the name "MidiSport 2x2 Port B" Thanks very, very much in advance, Mark