The easy way: Run
paprefs, go to Network Server and check Enable network access to local sound devices.
Whenever you SSH with X11 forwarding enabled, PulseAudio programs use X11 to discover your sound server (use
xprop -root PULSE_SERVER to see for yourself). Just tell PulseAudio to listen for network connections (
paprefs as described above), and all X11 programs will be able to use it.
(Other users will not have access to your sound server, unless you allow it yourself in
paprefs. The authentication data is carried over in the X11
PULSE_COOKIE property, or you can copy
Note however, that the PulseAudio stream is not encrypted this way, so it is okay for use at home, but not over the Internet.
The slightly more complicated way: Enable network access as above, but tunnel PulseAudio over SSH TCP forwarding. Use
pax11publish to discover your PulseAudio port (usually 4713), connect with
ssh -R 24713:localhost:4713, then run
export PULSE_SERVER="tcp:localhost:24713". This will be slightly slower due to SSH overhead, but is safe to use over the Internet.