Input distorting badly and strangely on TI

[solconnection]

Hi there, hoping someone can help with a little problem im having with the TI. Sorry if its a bit long winded, id really appreciate anyones advice, thanks for bearing with me.

Went to do some music today and my motu ultralite's not turning on (hopefully just a fuse or something), at any rate im trying to now create the following setup using my TI as a soundcard.

1x midi keyboard
1x Virus TI
1x Moog Voyager
1x Macbook Pro

Midi:
I have the midi keyboard going in to the TI's midi in, a midi cable going from the TI's midi out in to the Voyagers midi in, the in and out on the TI is controlled via usb...all seems to be working in this deparment, i can control the TI via VC and the voyager using the 'TI midi' outs.

Audio:
I have the outputs of the voyager going in to the analog ins on the TI, i have the analog outs of the TI going to my speakers. This is working but there is a problem

Problem:
When i try and play the voyager with the midi keyboard, i get a weird distorted version of the voyagers output (voyager output sounds fine directly from its outs and its headphone outs, so i know the distrotion is happening somewhere in the virus). When i go in to config on the TI and set the input thru to 127(100%) i get the voyager as its 'supposed' to sound, mixed with the weird distorted version of it.

Anyone have any ideas why im getting this distortion?, I would have thought i shouldnt be able to hear anything from the voyager until i set the input thru above 0.

thanks so much for any advice, its much appreciated
have a nice day
-Dan