[TenTec] Another RTTY story

[John Nason / NA9U]

I am using UA9OV's RTTY software TrueTTY.  For some
reason the software won't key the rig (other software
does, Sergie is looking into that).  

I put the RTTY audio into the Aux line in port on the
back of rig.  I then set the TX input to BOTH (MIC and
AUX).  Shouldn't the VOX trigger the PTT if I have it
on?  There is sound coming out of the PC, I hooked a
speaker to it.  The VOX does not seem to respond to
input on the AUX line.  Any thoughts before I call
TenTec?  
Thanks,
73,John