Keynote Audio only left channel

Has anyone else had this problem and how did you solve it?  I am using an M Audio Fastback USB input to record to Keynote and the audio is only recording to the left channel/speaker.  Can someone tell me what I am doing wrong or how to fix this? 
Thanks,
Paul

System Properties >  Sound
in the output tab, select Fast Track USBand centre the Balance slider
in the input tab, select Fast Track USB and move the volume slider to the far right
Applications > Utilities > Audio MIDI setup > M-Audio > Input;  set the master to the far right
The front panel controls affect analogue phono out connectors and the headphone jacks for monitoring, they do not control recording.

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