4.8 Troubleshooting
Problems may pop up every now and then when using the 12 Step — here are some suggestions that
can potentially solve them.
Connectivity Issues
Check that you’re using the correct USB port on the 12 Step
There are two USB connectors on the 12 Step hardware — the main USB port (the USB B
connector labelled “USB”) and the Expander port (the mini USB connector labelled “Expand”).
When connecting to a computer, always use the main USB port. The Expand port will not work
when connected to a computer (though it will power up), it is exclusively for use with the KMI
MIDI Expander.
Try a new USB cable
One of the first (yet most often overlooked) things to try is a different USB cable, preferably one
that is known to work well. When a cable goes bad it can lead to all sorts of odd behavior, or
no behavior at all.
Try plugging into a different USB port
It’s possible that trying a different USB port on the computer may lead to a proper connection.
While extremely rare, we have come across USB ports that just don’t seem to like the 12 Step.
Do not use an unpowered USB hub
Unpowered USB hubs may not be able to provide enough power to the 12 Step, leading to
connectivity issues. Unpowered hubs typically divide the power coming from the computer’s
USB port and split it into each of the hub’s ports —!providing less power than if the 12 Step
were to be directly connected to the computer’s USB port.
If a USB hub is absolutely necessary, always use a powered hub.
Try without a USB hub
If experiencing connectivity issues while using a USB hub, try without the hub and plug directly
into the computer’s USB port. This will potentially lead to a proper connection.
Be aware of bugs native to the operating system being used
While it is indeed possible the 12 Step may be the source of issues, sometimes the cause is
actually due to the operating system itself. Always be aware of these issues, like the Mac OS
CoreMIDI bug or the Windows class-compliant device limitation.
Appendix 57
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