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Laura's suggestion about writing a simple program is a good idea. I
wonder if there is any WELL DOCUMENTED source code for a sound card
based 1200 baud packet modem, which could be suitably modified. If so
I would like to have a go!
This one's inside the LINUX kernel, which i have attempted to document:
http://www.qsl.net/kd6pag/localcopy/sm_afsk1200.c
Now, being packet-oriented and being structured as a device driver, it may
not be so applicable to UO-11, which, if i recall correctly, operates in
something like RTTY mode. But it may give you at least one idea on how to
implement it. I have constructed scaffolding for testing such drivers in
user mode, but i'm not really happy enough with it to distribute it at this
time. Best of luck.
-- KD6PAG (Networking Old-Timer, satellite QRPer)