Why is my SP/DIF input quiet in Logic Pro?

Can anyone please suggest why my drums, inputted via SP/DIF are really quiet in Logic Pro 9.1.3?
The strange thing is that their volume looks healthy in and out of my Fireface 800 software mixer panel (Fireface 2.62, Fireface Mixer E2A) it's dancing about in the middle of the meter strip - but the signal arriving in Logic from there is really quiet, down in the bottom 5-8% of the strip with the slider set at 0DB.
If I apply a 12DB Gain insert in Logic, the level in the Fireface mixer out is on the border of clipping and yet the drum track is still way too low in the mix.
All other levels in and out are fine, from analogue and software instruments. I'm using a Logic Pro 9.1.3, Fireface 800, Mac Pro 2 x 3.2 GHz Quad-Core Intel Xeon, 8GB RAM, OS X 10.6.6, Roland TDW20 Expanded V-Drums. The drum signal is synced at 44.1Khz and that's the only signal path from them to Fireface and Logic.
Any suggestions greatly appreciated!

Thanks, it's so kind of you to help. Yes, set to + 4db. I'm going to try updating all the software the Fireface driver and software, and going from OS X 10.6 to 10.8, then Logic.

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My mic is not appearing as an input option in Logic Pro X preferences

I am having trouble getting Logic Pro X to read my microphone as an input source. My computer is a Mac OSX 10.8.5. I believe my microphone is a Shure SM27 Large Diaphragm Condenser Microphone. The audio interface, as you can see in the pictures, is an Avid M-box.
I'll preface this by saying I am not technologically savvy whatsoever. Here are the directions I've been trying to follow to get my microphone to work, so I can start recording: http://www.co-bw.com/Audio_Recording_Logic_Mic_HookUP.htm
However, that page shows the Audio Midi Setup toolbar as having an "audio" option that you can click to find the Aggregate Device Editor. For some reason, as you will see in the picture I've attached, my Audio Midi Setup does not have that option.
I've also attached pictures of every component involved in this process to give everybody a better idea. It doesn't make sense to me why my microphone isn't recognized by Logic, but I'm hoping somebody can help. If you can, I would be extremely grateful, as this has been an extremely frustrating process. Thanks.

Just to be doubly clear: your Mac OS - Audio MIDI Setup will NOT see what is plugged into an audiointerface, it only sees the audiointerface itself and all its available in- and ouputs.
Second, those instructions you linked to are (I think) for Logic Pro 9 on OS X Snow Leopard, or older - the layout of AMS has changed somewhat since. You can find the Aggregate Device editor by clicking the little cogwheel bottom right of the AMS window.
But: you'll only need an aggregate device if you need to record your Sure and the built-in mic simultaneously. Or if you want to use your Avids' outputs and the Macs' output simultaneously. To just record your Sure, all you need is to select the M-Box as input device (replacing the built-in mic in picture 2), then, in Logic, create a mono audio track and choose the right input (1 or 2, probably), depending on where the mic's plugged into.
BTW, those plugs are commonly known as XLR plugs. Also, the microphone need phantom power. Don't forget to turn that on, or it still won't work.
And, to repeat Pancenters' point: right now you appear to have the built-in microphone of your computer selected as the only input source.
Under Logic's Help menu you'll find the complete manuals.

Loaded Instruments Too Quiet in Logic Pro X

Hi,
Firstly here is my setup:
Mac
iMac 21.5-inch, Late 2012
3.1GHz Intel Core i7
NVIDIA GeForce GT 650M 512 MB
OS X 10.9.4
Logic
Logic Pro X
Version 10.0.7
I use Logic with Kontakt and PLAY for loading different sample libraries.
PLAY version 4.1.8
Kontakt version 5.3.1.37
(As far as I know; all of this is as up to date as it can be as of the time of writing)
Now the problem:
Very simply put, instruments seem to be loading from either Kontakt or PLAY at low volumes, when they never have before. The reason I have asked this question in a Logic forum is because I have started to notice Logic only instruments doing the same thing. For example, the default software instrument: Classic Electric Piano, nearly always loads quietly. I have to select another instrument, then go back to the Classic Electric Piano for it to load at the correct volume.
Now to expand on this issue, I notice that the levels of the track indicated in Logic are still at a reasonable volume - and supposedly as high/loud as other instruments. But when I play notes on the quieter track the output volume through my iMac's builtin speakers is extremely low. In order to counteract this, I have been turning up the volume for these quiet tracks in the mix, as well as adding compression to increase the volume - but the downside of this is that the overall quality of the instrument is lost because it also turns up all the other things in the track (i.e. natural reverb, feedback and fuzziness) that would normally be unheard when the instrument plays at the correct volume.
I hope I have explained this well enough. It is hard to describe what happens without you actually hearing the difference. I do not really know what has caused this to happen - is it Logic? PLAY? Kontakt? Or even my builtin speakers? Do I need some external ones? - and it seems to have started quite randomly. It also seems to randomly happen on any instrument in either Logic, PLAY or Kontakt.
Hopefully someone will have some idea of what I can do to fix this problem and return my instrument's to their default output volume without the need for compression.
Thanks,
and with kind regards,
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I haven't used Logic X yet, but previously there was a preference regarding whether a new track would load the default Electric Piano.
So the way you're describing it, turning that off would fix your problem? Although I don't know why it's so quiet and perking up after switching instruments.
I have noticed that when I load evp88 (is that what it's called?) into a blank audio inst track, it's really low. I just assumed that how it was.
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Hello,
Question. I have an Apogee Ensemble audio interface hooked up to my Macbook Pro. I have a Motif XS8 that I record audio from through SPDIF.
I am able to get sound through to my audio track once setting the inputs in Logic, however the levels are not even close to halfway. I can not figure out how to fix adjust the SPDIF level to make it hotter b/c I know once I add virtual tracks and vocals through my preamp, the audio from my motif will likely not be hearable.
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-18 dBFS on a digital scale is the same as 0dB on an analog scale.
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Message was edited by: Pancenter

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Why is my SP/DIF input quiet in Logic Pro?

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