How can I get guitar effects from my VoiceLive Play GTX to my guitar amp?
The VoiceLive Play GTX was not designed to do this, however it can be done.
You will need to put a device in between your VoiceLive Play GTX and your guitar amp to help transform the output to a signal your guitar amp is looking for.
Change your output in the VoiceLive Play GTX setup menu, on the output page to dual mono. In this mode, your vocal comes from the left output and your guitar comes from the right output.
The most cost effective way is to use a line match transformer (low to high impedance converter) which is available at may music stores.
The more expensive way and by far the best option is to use a re-amping device like these: http://radialeng.com/r2011/reamping-products.php
This type of device takes a line level input and puts out a guitar level output.