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Here's a useful utillity module for your modular - made by quirky manufacturer Touell Skouarn - they are based in Brittany France and up to now have specialised in hand made boutique pedals.
The Jedonian is a module that interprets Korg MS20 Trigger and CV (Hz/V) into Eurorack trigger and CV (V/Oct).
If you've ever tried to plug one to other you'll have come across the difficulties of this language barrier - for one thing, the trigger is inverted, so key-on is the opposite polarity in Eurorack speak - not too difficult to fix, but the scaling of the Control Voltage (which is the scaling of the pitch) is much more tricky.
The Jedonian - with its vibrant plexi-glass facia (10hp) swings both ways, converting Korg to Eurorack and Eurorack to Korg. From Korg to Euro is pretty striaghtforward to setup - once its set and tweaked to suit your particular MS20 - original, Kit (as we used here) or MS20 Mini, you can pretty much forget about it. The other way is more fernickity to set up, but again once set you can pretty much leave it be, unless you want wierd keyboard scaling that is.
Hard to fault, does what it says it should with minimum fuss.
Priced at around €139/$TBD Available from most good modular dealers.
Alternative - Harvestman - English Tear