My goal is to control one arranger with another arranger.

Example: I would like to use the BK-9 as a controller, to control the arranger and the other parts on a Korg Ek-50 that has 61 keys.

You might ask what's the reason?

Well the reason is, that the Korg EK-50 has 5 tracks where you can record plus an accompaniment track, and you can go back and overdub which ever track you want, while the BK-9, is more difficult.

You might ask: why don't you just use the Korg's key bed?

Well the thing is, it has only 61 keys, and some of the songs that I play require a 76 key instrument like the BK-9.

Problem is BK-9 has an old type Midi OUT connection, and also USB to Host, while the Korg EK-50 has only USB to Host MIDI connection.

Question 1: Can I control the arranger and the parts on the EK-50 with the BK-9 used as a controller?

Question 2: What do I need (like cables, or any other gizmos) to connect the two?

Question 3: Or I should just forget about it?