Im not sure which alpine decks are compatible, but I think if the changer is an aI net then any alpine wityh changer control will work.
The OEM unit does not have preouts.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>