Keep what you get , ther isnt much improvement when you exchange your Korg & Yammie fore a SX900 .
Met wat je nu hebt kan je alles wat muzikaal nodig is.

Impuls smile
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Genos2,Korg Pa5X , Yamaha YC61, Ventilator2 . : https://www.youtube.com/channel/UCmC6hdAR1v5lYN8twfn0YbA