Connecting MX49 and Ultranova to Cubase

I have Cubase LE 9.5 and a Focusrite 6i6, MX49 and an Ultranova.

This is my config:
USB cable from PC to 6i6
5-pin MIDI (cable 1) connected to MIDI OUT on 6i6
5-pin MIDI (cable 1) connected to MIDI IN on Ultranova
5-pin MIDI (cable 2) connected to MIDI THRU on Ultranova
5-pin MIDI (cable 2) connected to MIDI IN on MX49
1/4 Audio cables from synths audio outputs to the audio inputs on the 6i6

Sound is working from Cubase, when I test the metronome it works. It looks like Cubase auto-recognized the inputs and outputs because
I didn’t have to add them.
But I get no sound from either Synth and I am not sure why?

Wouldn’t you know, after I posted this and played with the settings more, now I get sound from both synths. I am reading the manual on Cubase but its like foreign. I need to start really basic.