How to cutoff delay when a note is held

[mysticsh]

Hey im pretty new to HISE and im using scriptnodes to create a basic delay plugin but im running into an issue where I need the delay to stop when a note is held or it creates this very harsh noise. I have tried using AI but its pretty useless on information. I would appreciate any help you guys could give and keep in mind im completely new so if you could dumb it down for me a bit lol.