MOST M-Audio stuff will work, but only after you change a setting.
The way they ship, the MIDI ports connect to the device itself, but if you change a setting, it will pass the MIDI connections to the IN and OUT ports on the back of the gear.
From the manual:
When installed, the Axiom appears as a simple MIDI device with two input ports and one output port. You should select the first
listed Axiom input port as the MIDI input device in your software. Once this is set, your software should be able to receive notes
and controller data from the Axiom.
If you have connected external MIDI gear like a drum machine or another keyboard to your Axiom’s MIDI IN port, this gear can
be interfaced to the computer by selecting the second listed Axiom input port. This way, your Axiom is acting as a MIDI to USB
interface.
It is also possible to stream data from your computer to external MIDI gear connected to the MIDI OUT port of your Axiom—
effectively a USB to MIDI interface. To do this, you should select the Axiom output device in your software. Note that some other
steps are necessary to make this work that will be fully explained later in this manual.
\
Later in the manual..
MIDI Out from USB can be used to switch the source of the MIDI data seen at the MIDI Out port of your Axiom.
On initial power up, MIDI Out from USB mode is off. This means that as you play your Axiom, MIDI data will be sent to the MIDI
Out port.
If you turn MIDI Out From USB mode on, playing your Axiom will no longer send data to the MIDI Out port. The data is instead
streamed from the computer. So, as long as you have selected your Axiom as the active output port in your computer’s sequencer,
this is the data that will be sent the MIDI Out port.
For example, if you want to control a sound module from your Axiom, you should ensure MIDI Out from USB remains off. If you want
the sound module to play data streamed from your computer however, then you should turn MIDI Out from USB on and ensure that
the output port for your Axiom is selected as the computer’s MIDI output device (this is done in your computer software).
To control MIDI out from USB mode:
49- and 61-note versions:
< Press Data 2 and Data 3 together to change the MIDI Out setting to MIDI Out from USB.
< You will see a MIDI plug symbol appear on the LCD display.
< To turn MIDI Out from USB mode back off, press the same button combination again. When you do this, the MIDI
plug symbol disappears.
25-note version:
< Press the Advanced button.
< Press the MIDI Out key to activate MIDI Out from USB.
< You will see a MIDI plug symbol appear on the LCD display.
< To turn MIDI Out from USB mode back off, repeat these steps. When you do this, the MIDI plug symbol
disappears.
All this is straight from your owners manual. If you look there you’ll also see some pictures that I didn’t post.
Have Fun,
LyleHaze