I can be wrong and I can not test at the moment, but from the description it seems like joyosc sends quite specifically formated OSC messages. Probably Reaper can not work with it:
Quote:
joyosc streams device event information in the following OSC address format:
/joyosc/devices/DEVICE_NAME/INPUT_TYPE ID VALUE
...
axis values are -32767 to 32767 (signed 16 bit)
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So, the first parameter is "ID" and the second is (non standard in audio world range) signed integer.
Usual format is "</name> <value>", where <value> is float from 0. to 1.