try the AD825 opamp, it's very good compared to default opamp OPA2134 (on prodigy 7.1 XT). but since AD825 is mono opamp, you will need 2 of them and use browndog adapter to fit to 8 DIP socket..
the prodigy 7.1 xt card is like this (default):
the OPA is for 1/2 channel
the JRC is for 7/8 (headphone) channel
the modded prodigy 7.1 xt card (AD825 at channel 1/2):
i already ordered AD8610, will be test it soon...
DURWOOD -> can you attach the prodiy 7.1 hifi control panel picture? the 7.1 XT control panel is like this:
