Dave,
Glad it was of some help to you. I had never really thought about the
use of digital modes for people with hearing problems, but it makes
perfect sense. You don't need to here the signals at all. In PSK just
click on the signal you want to decode and read the incoming text. In
RTTY, use one of the various ways to tune in the signal by sight and
read the incoming text. Pretty cool. Hope your friend has success with it.
73, Steve KW3A