the fousb driver uses product/vendor id to find the usb devices.  since 
fine offset does not include any other information (e.g., serial number), 
there is no way to distinguish between two fine offset stations using 
device information alone.

if you use an old version of pyusb you might be able to distinguish based 
on hub/device path or identifier.  but these are subject to change whenever 
you unplug/replug or restart the system.

you could put each station onto a separate usb hub, where each hub has a 
unique identifier that persists through restarts.

unfortunately later versions of pyusb removed the hub/device information

m

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