Quoting Edward Barrow <edward(a)copyweb.co.uk>uk>:
I've got a Terratec DMX 6-fire card
(ice1712/envy24 chipset) running in
a headless box with no X; I control it from the commandline over ssh.
Does the box you command it from have X? You could then open the envy24mixer
from the remote machine to the X server running on the "client".
To enable X11 forwarding from the ssh client do:
ssh -X user@host
You might need to enable X11 in the server sshd config, in debian: add or
uncomment the line:
X11Forwarding yes
in /etc/ssh/sshd_config
Sampo