Connect to a different computer
If the 12 Step is not making a connection to the computer at all, it is recommended to try
connecting it to a different computer. If it works on the new computer, try the original one
again. In some circumstances we have seen this solve connection issues.
Mac OS CoreMIDI “bug”
There is an interesting (potential) bug in CoreMIDI on Mac OS that can lead to some connectivity
issues —!not just with 12 Step, but with any class-compliant MIDI device.
Upon connecting the 12 Step (or any class-compliant MIDI device) for the first time since powering
up the computer, the 12 Step will make a proper connection to the computer but will not refresh/
update the MIDI device list.
The effect of this is that any audio/MIDI applications that are already open (like the 12 Step editor,
Ableton Live, Logic Pro, etc.) will not detect the 12 Step, even though it’s properly connected to the
computer. The only way to get the MIDI device list to refresh is to unplug then reconnect the
controller, or to manually refresh the MIDI devices by rescanning MIDI in Apple’s Audio MIDI Setup
application (located in /Applications/Utilities).
What’s interesting is that this behavior does not occur if it is the first time the controller has ever
been connected to the computer. It seems that when the MIDI device is created in Audio MIDI
Setup the device list gets refreshed, but if the device already exists in Audio MIDI Setup the list
does not refresh.
Whether or not this behavior is intentional and expected, it is something to be aware of. We have
noticed it on Mac OS 10.6 through 10.9. The one thing to do to minimize the chances of running
into this “bug” is...
After powering up the computer, always connect the 12 Step to the computer before opening
any applications.
“Okay, so how do I fix it if this does happen?” Well, if you do run into this problem, there are a
number of ways to fix it:
•
Unplug the 12 Step and plug it back in.
•
Open Audio MIDI Setup and click the “Rescan MIDI” button in the MIDI window.
•
Open another audio/MIDI application.
All three of the above methods refresh the MIDI device list, which should lead to proper “in-app”
connections.
Windows Class-Compliant Device Limitation
All versions of Windows do not allow a class-compliant MIDI device to be connected to more than
a single application at a time. As a class-compliant MIDI controller, this applies to the 12 Step.
The result of this is that if you have two or more audio/MIDI applications open at the same time
(the 12 Step editor and Ableton Live, for example), only one of them will be able to connect to the
Appendix 58
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