Hi @swingmix
A quick search of the forum using the word CAPTAIN has found this thread.
As you will see that it is impossible to link SCALER with CAPTAIN plug-ins. The only way to use the two together is to export midi from SCALER and import it into CAPTAIN CHORDS. This is a limitation of CAPTAIN plug-ins.
NB Rember that if you are using Ableton Live you will have to export the midi clip from Ableton Live before importing it into CAPTAIN CHORDS, as Ableton Live clips are not actually midi clips.