Arranger track in Studio One is of course a very usable function when trying out different structures for your arrangement. However, if you have an upbeat or a longer passage for an instrument track containing MIDI notes, it completely cuts them off when you copy a section of your arranger track. Any audio tracks within the arranger section can naturally be expanded both in the beginning or end, but not instrument tracks containing MIDI notes. If you try to drag and expand the beginning of the part to reveal the upbeat notes it's completely empty outside the arranger track range unfortunately. If you need those notes outside the boundaries of your arrangement section, you're left with no other option than to find that section in your arrangement and then copy it to the new destination manually. Strangely, this is not the case if you are just moving an arranger track section, it only happens if you copy it.
Please Presonus, fix this so that Arranger Track can be used as good with MIDI as with audio.