@Adrian
The white wire on my Amiga (now i've taken off the phono sockets) is simply providing Left and the red wire Right. The yellow wire would be a second ground that's unecessary. The thing you have to think about is how the circuit acts with the phono socket soldered in. If they are still left on as you want to have them, the right plug will be bypassing its channel to the left side with no phono plug inserted, its only when you insert a phono plug into the right socket that it is mechanically disconnected from the left side.
So if you leave your phono sockets in place, then solder wires under the board, you're going to get left and right audio mixed together with no Right side phono plug inserted.
So if you want to do it, you're gonna have to go all the way mate! Rip those Sockets off!
The alternative is to have 2 phono plugs from your Amiga coming straight back into the case, then connecting to the Delfina Line in, then having a seperate set from the delfina output to your stereo. Then you could have a second set of phonos you could swap out when you only want to use Native Amiga Audio.
@ancalimon
Well I only changed some of the physical connections to make the Delfina more "flat" and so it could fit inside my A1200.
I took off irrelevant headers
Hard soldered the Clock port cable to the board
90 Degree angled a capacitor
took off all the phono and CDDA style sockets and lead them on wires
I have since made the inputs and output neater than the pic you posted too: -
I then stuck a thin piece of plastic under the board to avoid shorts
If you want to perform this mod, then please be careful with the two tiny capacitors under the clock port connector if you use a PPC accellerator these are vital, if not you have to take them off anyway so no biggie
1 - It looks pretty much like the photos! quite a beast and not very desktop friendly. Its most certainly not designed to fit in a Desktop.
2 - If you ONLY want to play MP3's and you don't think you can modify the connectons how I have, then maybe yes, but i've honestly never used an MP3@64, I thought it was only for the C64, so thats how much I know

. But when its running, the Delfina sounds soooo nice! It can be a bit of a ball ache to get running correctly on a heavily modded Workbench (As i'm finding now). It also doesn't work in Amiga OS 4.1 Classic (Much to my dismay). But I can heartily recommend it.
3 - It plays MP3's just sweet. Depends what you mean by lockups? whilst its playing MP3's? not that i've found, when its not set up correctly? yes, it can reak havok on my poor old '12
