Hi xylo,
MIDI plugins are not supported in Podium. You must use a sub-host for this kind of plugins. I’m currently using Wusik VM.
Another “workaround” is to use a virtual MIDI input/output driver, such MIDI Yoke or even better, CopperLan, but this way it’s more complicated and in Podium Free “MIDI interface setup is limited to one input and one output.”
I’ve tried DSP Trigger with Wusik VM e UVI Workstation (sampler) and it seems to work.