Hi @dimitris.mitrolios. Check if this works:
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Open Reaper, go to Options > Preferences… > MIDI Devices and check that your device is recognized at MIDI inputs and MIDI outputs.
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Double click on your device at MIDI inputs, check Enable input from this device and Enable input for control messages . Then double click on your device at MIDI outputs and check Enable output to this device . There’s a video that goes through this.
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Create two tracks. Insert the VST2 version of Archetype: Plini on the first track. Then go to the second track and make it a sub-track of the first one by drag-and-drop or by clicking on the folder icon at the bottom-left corner of the track:
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Go to the second track and set the input as your MIDI device (Input MIDI > All MIDI inputs > All channels ). You can also make a send from the MIDI track to the Plini track.
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Enable monitoring and check if the track receives an input signal when you send notes/PC/CC messages. It should get registered on both tracks:
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You can record some notes/PC messages to check if everything is routed correctly:
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After this, you just need to map your presets/parameters using the MIDI learn function or the MIDI mappings window. You can also use this method to automate preset changes through notes/PC messages.
I think there’s also another method using ReaControlMIDI. There are plenty of tutorials that show how to use it: ReaControlMIDI Plugin in REAPER