Thanks, I am very happy with the hack myself. Unfortunately, I did not take pictures as I went along. I was also using this as a teaching opportunity for my 9 year old son to show him how the scope works and what the difference is between digital and analog signals. We had fun making and burning the test CD with sine wave tones and seeing the same waveforms on the scope later in the car. We also looked at music waveforms and how that was different from pure sine wave tones. So, I neglected to photo-document the process. I may still do that because I did not figure out which pins on the Alpine cable and Volvo socket the audio signals live on. I was happy to just splice into the adapter since the wires are already exposed there. For the info to be useful to the Volvospeed crowd I would need to tell them which pis carry the audio. From all the info I have it wouldn't take long with a continuity meter, but I would have to take the adapter apart again and that would be a good time to take pictures of everything I did.

Glad you like the picture. This was taken in '99 when the car was still pretty new. both the car and I are older now. But still as crazy as ever (me, that is).
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Vladimir. '98 S70 base, 5-speed manual - his, '93 945 (approaching 200K miles and rolling on...) - hers