Just fired up my A4 to check:
Hit function + global then go into Midi config, then Midi port config you should see both the Thru and Out options. Set whichever one you want to use as DIN24 (not DIN48 as that’s for Korg machines and will make your 303 play twice as fast)
And their you go! :slight_smile: I can’t remember if you have to do this every time you change a project or not, but not hard to do!
And remember to use a DIN cable, not a MIDI one! easy to get them mixed up (so all my DIN cables are a different colour)