There may be an easier way than what I’m about to suggest, so waiting for some other responses could be wise. I’ve been a bit out of the loop as I haven’t had a lot of time, and am only getting into Podium now.
The way I would do it currently needs the following: ASIO drivers that show multiple inputs and outputs to Podium (presumably any device with ASIO drivers does this, but if you needed to use multiple audio devices, probably ASIO4ALL would have to be used). supports multiple outputs, so something that can route, or there might be freeware out there that can do this, but I own energyXT and would probably use this.
You can setup an “output device” that does “mono 12 channels”, or if you wanted to use all outputs of the device, 24 channels. Then create a group track and add the multiple output VST as an effect. Within that VST make sure it’s setup to direct the stereo input to all output ports. Then, inside that group track, create all the rest of your tracks.
Be aware that, currently, within a group track that has another track with a Podium mixer bus return assigned to it, you cannot select midi input sources on child tracks.
Please let me know if you need a more detailed explanation. Hopefully there’s another way which others may be aware of!