You posted originally in a non-posting Forum. This is where your question needs to be.
I'm sure you'll get some good answers soon.
In a nut shell, you can unplug your CDG Player, and plug in the Hoster computer. If you already use outboard compressors, limitors, etc. off your Macki, they can still process the audio stream.
The only thing I will make a note about is that "Multiplexed" songs where the vocal+music is on one track and the music only on the other track (of a stereo song), Hoster does not yet offer a way to play the multiplexed song music-only track "bridged" to the Left and Right speakers. That is coming.