Declare and Plugins

I’m in the process of learning XOJO.
Can anyone point me to some readings on how to use Declare and Plugins in XOJO?
My project is a music application and will surely use Audio plugins from MBS since I will need MIDI.
Also will be using Lylipond for the music notation aspect.
Thanks for any help.

For plugins you put the plugin in your Xojo plugin directory and then start Xojo.

Then you usually will want to look at the example projects from the Plugin author and or the documentation.

Declares someone else will have to comment on.

@Björn Thanks for the reply.

For Windows, I recommend Eugene Dakin’s book Implement API Declares with Xojo on Windows, available on

Thanks for all the replies