Analogue-sequencer

Hi,

when connecting a synth at the Sync output, I get a 'MIDI
communication error' on the synth. I've got board v 1.5 and would like
the MIDI as well as the DIN sync option. So I soldered R36, R24, R25
and two diodes on D2 and D3, but omitted the resistors on D4 and D5.
Then I soldered ALL resistors and wire bridges on the I/O board. Is
this correct ?

When this problem persists, I'm happy to just use Midi sync...