Hi and welcome to the site, I have seen the interface you have purchased before. unfortunately there are a number of these coming in from China, all of the same design. They sometimes work but many will only work in a hit and miss way like you describe wi…Hi and welcome to the site, I have seen the interface you have purchased before. unfortunately there are a number of these coming in from China, all of the same design. They sometimes work but many will only work in a hit and miss way like you describe with notes sticking on etc. The units often have components missing and sell for as little as 99pence on Ebay. Mike (admin) uses the “Roland UM one” and I use the VOKER/WERSI/ETBOTU unit from Amazon. Sorry you are having problems but it is important to use a good quality interface as a unit with missing components can cause damage to the MIDI interface in your keyboard due to the lack of a photo-coupler which protects your keyboard from rogue keying signals etc. Regards John.