This may have been covered before by someone else, but i just wanted to share how I'm utilizing MIDI Designer Pro as patch sheets for analog gear (rather than writing down on patch sheets or taking photos).
What I've done is create layouts for the following gear: Moog DFAM, Arturia MicroBrute and MiniBrute 2S, and Behringer Model D, Crave, and Neutron. Then, when I've come up with a patch I like on the hardware, I simply call up the layout in MIDI Designer Pro and set the parameters. In the case of patchbays, I simply put it into design mode, color the individual buttons unique colors to their respective In/Out points, and then take a screenshot. Works great!
You can see here the layouts I've created here:
http://www.wcmess.com/mididesignerpro/
Towards the bottom of the page are some sample use case scenarios.
Next up is to deal with the problem of linking up different semi-modular pieces of gear together.
Let me know if anyone would like me to upload these layouts. Cheers!