So, do you want to know exactly how fiddly I am about my module selection? Today, I sold my Mutable Instruments Links module. It's a basic utility module, and it had some nice features.
So I put it up for sale, and today it hit USPS on its way to a new owner. Now, I'm sure that there are many people howling, crying and throwing their shoes at the screen right now - because that sounds like the stupidest reason that anyone could ever have about not wanting a module.
But I believe strongly that, when designing an instrument, you have to beware of cognitive "speedbumps" - things that cause you to pause, even for a microsecond, about the organization of said module. Guitar players will often dump an instrument if the neck is 1/16th of an inch too thick, or the volume control fits in the wrong place on the crook of their pinkie finger. I think of my modular in the same way that I think of my guitars, and the lack of consistent panel imagery threw off my immediate sense of the "Mutable group" in my rack - and therefore caused me to have to think for a microsecond more than I needed to think. When I replaced this with an Intellijel mult and Triatt (one of my "Intellijel groups" is just to the right of the MI group...), I immediately felt more comfortable and confident in the use of that section of the modular without thinking.
I actually believe it was more than the lack of a band. This is one of the few cases where MI put too much stuff in too small of a package - the face is almost all jacks, each of which serves a different purpose. The result is too much thinking - and the speedbump process begins.
First world problem, but in this case I can afford to be picky, and to engineer the instrument that allows me to be most productive.