LE doesn't receive additional input channels

Question

I'm trying to add four more input channels to my recording system and Logic Express is not registering any signal.
My main unit is a MOTU 896HD and has been working very well for the past year. I recently added a Presonus Digimax 96K and connected it via the ADAT Lightpipe.
Using the MOTU Cuemix console, all inputs are functioning and operating well. I've tested the unit and have gotten output from all available channels (8 from the MOTU, 8 from the Digimax). The problem is that Logic is not showing any signal from input channels 9 - 12 (I know that Logic Express is limited to receiving 12 simultaneous input channels).
I assume that LE will simply add the first four channels of the Digimax to the list of available input channels for a total of 12 channels.
The drop-down menu in the I/O selector show 12 inputs and I can select one of those tracks, but no signal is received.
Any help is greatly appreciated.

Answer 1

So here's what I found out, on my own, by digging under the hood:
The Mac uses the "Aggregate Device" through the Audio MIDI Setup utility. When I checked it out (last night, for the first time) it showed the MOTU 896HD with 20 inputs and 22 outputs. The Mac OS had already recognized the increase of channels introduced by the DigiMax. So then I knew my problem was within Logic (what a lousy name for such a confusing program).
A friend of mine, who records with MOTU Digital Performer, suggested that my problem was a "routing loop." So I looked for proof that channels 9-12 in Logic were not actual recording channels. This proved to be the case once I understood how to read the device info in the Audio MIDI Setup utility. It turns out that tracks 9 & 10 are for AES/EBU and tracks 11 & 12 are for "Mix1". There was my faulty routing loop. Tracks 11 & 12 were the ones that gave me squealing problems.
Tracks 13 - 20 were correctly labeled "ADAT" in the Audio MIDI utility.
So, I went back to AudioDesk (free with the MOTU 896HD), where I have been having great success in setting up my live recording channels (i.e., no feedback, good signals on all channels). When I create a new track in AudioDesk, it's simple to select the correct input channel. In other words, input 9, 10, 11, & 12 were actual input channels, not an AES/EBU signal or a "Mix1" signal. It was in the program's "Audio Monitor" panel that I saw that input signals for tracks 9-12 were actually from hardware channels 13-16.
I went to bed and considered my problem solved.
The bummer from this lesson is that Logic Express accepts only 12 inputs. To access any inputs (hardware channels) above #12 I must either upgrade to Logic Pro or switch to a new recording software. I've spent about $200 on Garageband plug-ins for MIDI instruments and feel just a little peeved that I'm in this predicament. 8^P
At this point, I'm not a fan of Logic. The product name should be "Sucka!", with the tag line "You upgraded from GarageBand and expected a similar interface, workflow and ease of use. Ha!"
I hope my little lesson helps someone else in the future.