I decided to see where I got the idea about tech not having meaning on the astral, and poked around my old SR books. Found a passage in SR3 (page 173) about astral perception.
QUOTE
The astral plane is a primal place. Abstract information is more difficult to perceive there. Written information and symbols carry their emotional intent rather than their informational intent. For example, you could see a stop sign and know it for what it is, based on its shape and color, but you can't read a street sign and know what street you're on. Likewise, you could scan a sheet of paper from astral space and get feelings of love and longing from it, but you can't read it to see that it's a love letter. Speech and other sounds are as easy to hear from the astral plane as they are in the physical world.
So it turns out I was wrong; you'd still be able to hear your commlink just fine according to this. I guess I remembered the part about not being able to read a monitor, and somehow extended that to all tech in my (warped) mind.
The only similar passage I can find in SR4A is on page 191.
QUOTE
Things that exist only on the physical plane can be seen and heard from the astral, albeit with blurred features and indistinct sound - emotional content registers far more strongly than exact details.
That kind of supports what I was thinking with the "indistinct sound" bit, though it's a pretty vague statement. Maybe your teammates talking on the commlink just sound a bit more distant, which I guess isn't much of a downside.
I also dimly remember something about mages going to concerts while astrally projecting and being able to pick up the music as well as the emotional content of the songs and the excitement of the crowd. I guess if tech couldn't be properly heard, it would make astral concert-going a bit problematic. I mean, you'd hear the roar of the crowd, but not the music blaring out of the loudspeakers, so you'd have to go right up next to the musicians to hear what they were playing.
I don't have Street Magic; is there any more exposition of astral perception in there?
I also still wonder about DNI. Would your AR display still show up overlaid over your astral "vision" if you were wearing a trode net or had a datajack?