MOD Users Guide
MOD is a host for LV2 plugins (similar to VST plugins).
The user interface for MOD is a web page hosted on your Zynthian device. You can drag & drop icons representing LV2-plugins of several types (modulators, equalizer, generators (=> synths), distortions, voice effects, vocoders, ...) and connect them together in a way which is really intuitive and easy.
You need another computer with a browser to access this website inside your Zynthian.
Browse to http://zynthian.local:8888
If that does not work, find the IP address for your Zynthian device on your local network.
and browse to that http://xxx.xxx.xxx.xxx:8888 (xxx.xxx.xxx.xxx represents the IP address)