Thanks again - I just set up the Digitakt as Ghostly specced, still no joy with the midi signal going to synth 2 + synth 3.
One synth has a midipoly retro fitted and the other a kiwisix, this could be the problem with the handshake with the digitakt maybe?
I will need a midi pass thru box, both the retro midi synths don’t have a Thru.
I also recommend getting a MIDI thru box. Get one with at least four ports (even more is not a bad idea), as there are so many MIDI instruments & modules these days that do not have a proper MIDI THRU port.
There are no routing possibilites in a Thru-box so you always have to decide which port to multiply. If your setup changed a thrubox soon reaches its limits. If you needed flexibility I would think about a Motu or an iConnectivity.