"My Loco" sound in Annie.

[Dave]

Have just installed a "My Loco" in my Annie but have found that the sound needs 7 - 8 volts to fire up and by then the Loco is nearly at warp speed, well, not quite, but it is well on the move.  Has anyone installed one of these sound cards and had the same problem or am I doing something wrong.  I have adjusted the trim pots for minimum volts but it still is a way out of sync. Paid NZ$110 for this so would be hoping that it will work.
     Any ideas would be greatly appreciated.
                        Cheers
                                Dave