Each of our 8 monophonic channels will provide its own connector for a breakout board. For that purpose, we will use a 16-pin DIP socket onto which one can plug a breakout board.
The sockets will be sufficiently spaced from each other so that large breakout boards can be used, including some that would include a small breadboard, thereby facilitating solderless prototyping.
And as mentioned in this previous article, it will be possible to map any of the 16 pins of a submodule to any pin of the Arduino core and any faceplate endpoint of the corresponding channel.
Consequently, the 16-pin DIP socket would become the standard interconnect for Ishizeno submodules, making them extremely cost effective when compared to standard Eurorack modules.