Thank you for prompt reply. I put in both modes, but the Mac does not recognize the drum. Is there any other way? Do I need to update the module firmware?
You stated in previous post and the image shows "Barramento USB 2.0"
e-drum medeli.. the Mac recognizes the module.
The DM6(Medeli DD501) is a very old module..very old drivers (10+ years) and hasn't had a firmware update since 2012.
ALL DM6 modules produced after 04/2012 had the firmware update in them
There was never an updater for Mac..Windows only and the Mac OS has changed multiple times and how the OS handles tracking old MIDI devices..
Try using a different USB port...make sure you are not using an external USB hub.
If no change..
With midi devices plugged into USB ports..Open Audio MIDI Setup. This is located in the Applications > Utilities folder.
From the menu bar, select Window > Show MIDI Window.
From the drop-down at the top left of the MIDI window, select New Configuration.
Name the new configuration.
This will cause OS X to rescan for any current MIDI devices, but also remove any old ones that are no longer connected.
Sometimes old “remembered” devices can interrupt MIDI communications on Macs.
Now, double-click on the IAC Driver icon. This will bring up a new window.
At the bottom left you’ll see a Ports section. Select any ports listed in there and click the minus button below to remove them all.
This will remove any "remembered" midi devices that aren't connected and you should be left with No Available Ports.
Any new midi device will then be added when plugged into a USB port.