TC-Helicon SingThing - How to have separate effects for guitar from voice

New

Just purchased a new SingThing and the instruction manuals (and YouTubes) seem very limited in instructions.  When I engage/change the "Effects" button, it seems that the effects are applied equally to guitar AND voice.  In other words, effects should be unique to each desired input (guitar separate from voice).  Frustrating to say the least.


Help please!?!?!


Andy