This is a really convenient module! It's a manual gate, or a three keys keyboard. The first "key" is a momentary push button and has Attack and Release settings. The second is a momentary toggle switch, no additional settings, and the third one is a toggle switch, no additional settings.
Unfortunately there are no building instructions for this module, but at least you'll find the schematic, some photos, and some comments.
The finished module without a faceplate.
The finished module.
That's it! Have fun and happy gating!