Maybe we need to sit in the shop for a day and plug a bunch of stuff together and try to break it until we figure it out.
Come By any time Brian... We are always "Trying to break it.."
So the problem is not on the computer side.. You can always get a secondary, Third, NIC for a computer to access both. Primary and Secondary Vlan1 or Vlan2
A device like an amplifier or mic receiver typically would only have one network interface.. In the PSM1000 with dual network ports, it is as you say.. A mini Switch...