Just to clarify, are you actually using the AKAI as a 'midi controller'? This usually means that this device is NOT actually making the noises, it is merely generating the midi data and something else is making the noises, for example a tone module, or another keyboard, or a virtual synth linked to the DAW.
The situation you describe points to a transpose problem. But maybe NOT on the AKAI?
Also, you don't say, but WAS the setup working correctly previously, and then stopped working correctly? Was anything changed/added at that time?
Geoff