@bleujazz3 - thanks for this. I’ve looked into this a little deeper. Switches with LEDs are easy to make. One would use a DPST switch, with one circuit sending signal to the fractal, and the other an internal circuit with a 9V battery, an LED and a resistor chosen in a way that drops the voltage to the LED into the appropriate range. DPST switches are latching, in the sense that the switch is either in an on or off state. As Unix-guy pointed out above, the LED, and switch for that matter, would tend to get out of synch as one changes presets, or even scenes within a preset (depending on settings). So I think he is absolutely right, and I should be using a momentary (cs perpreset, last) and using information from the fractal front panel to monitor state (which is easy to do in the AX8). I’m not sure how to do that yet - I am waiting for my chance to buy an FM9 (c’mon ice cream!) and that is when this all becomes real.
In the meantime, I’ve discovered that you can buy small momentary switches for less than you can make them (see Saturnworkspedals.com for example). And that is the resolution I’ve decided to pursue.
Thanks!