hi, I'm Monica
I have catalina 10.15.6 I work with pure data and simple Synth 1.2 does not load me not mine opens inside catalina. could you send me the symple synth link for catalina 10.15.6 thank you very much

@Monica

I had a look at the Simple Synth web page https://notahat.com/ and the developer says: "These won't work on macOS Catalina, and I have no plans to update them. Sorry!"

Perhaps people here can suggest an app that does something similar... a free synth with a 'complete general MIDI instrument set built in, and it can load Soundfonts and DLS files'...or maybe even an equivalent made in pd.