hi,
here is my smaller version.  
but itґs not the last version.
the next step is to connect an USB2.0 chip for simply download files.
the second step will be an industrial PCB  

hi,
you can connect both players in series. the mdp has an input where the cd should connected.

the mdp works fine together with the emulator.

only if you want to use cd changer an emullator togther, then you have to switch between both.

hi,
I want to built an HDD MP3 player which can be controlles by Pioneer radio.
I know that its already made, see Yamp3usb and vitats adapter, but I want use an USB2.0 chip for faster fileload and STA013/CS4334 for better soundquality.

but I have some questions about IP bus ( adapter ).
what happens when I connect the adapter while HU is running for example at tuneroperation?
will the adapter successful recognized? so I can change to CD changeroperation whitout problems?
what happens when I disconnect the adapter while HU is running ?
will the HU successful recognize that there is no more cd changer?
oder could it be that he HU software crashs so I have to reset or turn OFF the HU?
what happens when a MD changer is also connected together with the adapter?
the background for these questions is that i have to decide the circuit design.
1. the controllpart is at the main mp3 player, so it would be disconnected while I have it at home for downloading files
2. the controllpart ist separated from the main player like vitalis, so that the HU views altimes a changer ( an empty if mainpart is disconnected )

it will be take a few days until ich become a running adapter because i have to order some parts for the adapter.
then I can start tests an maybe I will answer my questions by my self if nobody has tested it befor.
I measuring up to now that the ASENBUS, BUSP1 and BUSM1 is enable as long as the ACC ( ignition ON ) in enable even if HU is turned OFF.

see you