How to forward incoming MIDI messages to USB Shield to USB midi effects device?

Hello everyone, I am new to the subject and require some help with code. Maybe someone can set me on the track:

I have a midi footcontroller that sends program changes and can send control changes. Here is what I would like to achieve:

I want to read serial incoming midi messages and forward them to the zoom pedal via an USB shield. (Needs to act as host for a Zoom MS 60B effect pedal with USB MIIDI)

I have seen Lawrence Doss build aan arduino based controller with switches and then forwarded this message to the usb shield and out to the effectpedal…

Instead of switches - I already have a midi message with a program change coming from my external controller - How do I get the arduino to read incoming midi and “relay” that to the usb shield where the message then reaches the effect pedal?

Is there a way to translate incoming midi to the usb shield? Would I need the regular midi library and the usb midi library in the arduino sketch? Thanks, for all help and some examples to start with
Best Regards

If the midi-in is a serial stream then you can just write the same characters out the serial port (same or different depending on your Arduino) using Serial.write().