Octatrack mk1. No sound from input b

I recently got an OT mk1 and i have instruments plugged in to a, b, c and d inputs. The green led is flashing when sound is coming from the instruments but I cant hear anything from input b.
Im a beginner and I have a hard time finding any useful information about this issue.
What should I look for when troubleshooting?

Welcome @DoctorSynth
Set a thru machine on one of your tracks.
Then set INAB on B
Place a trig on TRIG 1
Press play

Check p.117 of the user manual

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Wow, thanks! It worked!

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Since you are using OT MK1, thru machine informations are in p.148 of the OT manual
Cheers