Can't Hear GM sounds from external Keyboard

Question

My system set up is a Mac Mini OS X 10.9.5   with 2.3 GHz intel Core i5 and 5 Gb of Memory . A Focusrite Saffire Pro 14 interface.
I am using a M-Audio Keystation 61es connected via the USB to to the Mac,( and have done for the last 2 years ),
when I was using it in Garageband it worked perfectly as a 'Plug-in & Go' keyboard and i could access and play both the GM sounds on board or the GB sound Library.
Since Upgrading to Logic Pro I can only play Midi voices and loops from Logic, although it recognises the Model of keyboard and allocates the relevant channel, it also allows me to see the onboard menu of GM sounds, and registers in the volume of the track a signal coming through the relevant channel, so i know its communicating somewhere.
But I can't hear ANY of the GM sounds from the Keystations on board library.
Have looked at all the Midi Settings i can find in Logic and followed some paths suggested in the various Logic Manuals, but still no Noise !
I am no Techno Head so please! if you know what it is that I am NOT doing , explain it the simplest way you can.
Thanks in advance for any help that can solve this Problem
MyKee.G

Answer 1

As far as I can tell, the M-Audio Keystation 61es does not have any form of on board sound generation. So whatever you heard in Garageband was synthesized by GB. In the same way you'll have to set up a virtual instrument in Logic to generate the sound.
Apart from that, it sounds like you are not really aware of the difference between Midi controller data and audio data, or at least the way they are routed. The midi controller has no way to send audio to logic through a midi connection. If it had on-board sounds, you'd have to route the audio explicitly to logic using an audio interface or in rare cases using audio over the USB connection that also does midi. In any case, you'd have to route the sound manually. The external instrument plugin in logic allows you to do that easily. But again, I don't think that applies to your situation.
Cheers,
Jazz