Sorry, should’ve been less flippant/more informative. I have the latest serialosc installed (never had one installed before); I have Bonjour installed (for other reasons), but I understand it’s not required any more? Regardless, I get absolutely not a peep from any Max patch, in Max or in Live. Running the serialosc-* manually from a terminal gets me nothing… There’s no lsusb or what have you on Windows, so I’m kind of lost as to how to proceed.
I have spent hours trying to get it working on windows 10. Serialosc hasn’t been updated in a while, maybe it isn’t working with the latest win10. My grid shows up as serial COM3, not as a USB device with a name.
Preliminary testing with @szymon_k’s node-serialoscd indicates “yay, it works”, but also “all LEDs on” causes the device to disconnect - I’m guessing it’s a power droop (all of the LEDs dim at once).
This is doubly hard as there doesn’t seem to be a way to connect the Teensy 4’s micro USB port’s data lines to… anything, really.
So, short of using one cable for power, and one for data (which of course means trying to dig up a data-only USB cable… is there such a thing?)…
 monome’s serialoscd will not work on Windows 10 with this device for me
Which pin have you connected from the teensy to the trellis for power? I ask because I’m using a teensy 3.6 and I haven’t run into power issues even with all the LEDs on. In my case I used the VUSB pin. On the teensy 3.5 and higher this pin is before the current limiting fuse, whereas on the older teensy’s it is after the fuse. If you used one of the 3.3v pins that might be your problem…