Thanks for all the responses.
If I get either of the vocal changers, how would I connect it to my current system?
I have Hoster and the Karaoke songs on my Laptop. I have the TV monitor connected to the laptop and my sound from the laptop connected via USB to a Bose T1 ToneMatch Audio Engine (mixer) and the mics to the T1 and the output from the T1 to a Bose L1 Compact Line Array System (power speaker).
Thanks for any help,