How to correct red latency?

[Netdawg]

I just started with Jamkazam.  My buddy has a very old Alesis eight channel audio interface.  We were able to play together, but on his stats, latency was red.  We went to Manage - Audio - Audio Booster and tried to lower the latency, but it resulted in static in his headset.  Do you think the audio interface is the issue?  Is that the place to start?  Typically is the internet speed the problem?  He has a standard cable internet connection and is wired in to his router.

Thanks for the help.