I’ve been in Altus for last 5 hours have slot 2 programmed into radio zero traffic however see busy as if slot 1 is busy… there is no reason they would use 2 as primary… I may be wrong I will be back in a week and put both in to see….. but my DM-32uv hears in monitor mode perfect but does not show 1 or 2 …. I’m sure my Kenwood NX-5700 & nx-5200 would RX if slot 2 was it