With MIDI you can directly connect because of latency in about just 3 instruments, and there interferes clutter. But I have bought the cable to connect the instruments to a hub, and as 3 m are optimal. There were also 6-m cable from the same dealer, but they are unnecessarily long for me.
The star's withdrawal from me because MIDI DIN plug are asymmetric due to design, and one due to the ill-conceived corrugations on these connectors do not "blind" can suffer. Each age-old PS2 cable creates. The cables were apparently not tested in practice. I've highlighted the top with a chunk of hot glue, but that's can not be well.