Discussion about the Korg PolySix synthesizer

Hi,
I am trying to reset the factory sounds on my polysix.  I have downloaded the data (.wav of 
the original tape)  from http://analog.no/ and have followed the manual to try and load 
them using the tape in input.  I can't get the led's to flash like the manual says and I have 
tryed adjusting the volume without any luck.  I have also checked that signal is coming out 
of the lead connected to my computer.
I was wandering if anyone had any ideas about what I might have done wrong.  I am 
starting to think the "tape in" input might be faulty.  

Thanks in advance,
Meezy