Convergence by Charles Sheffield read by Geoffrey Howard (aka. Ralph Cosham). 32kbps mono. 8h 30m. Resonable audio quality though not the best.
CONVERGENCE is Book Four of the Heritage Universe series
Humans first reached out to the stars traveling at a painfully slow sublight crawl-then they found the Bose network, which allowed ships to jump instantaneously from one node in the galactic arm to another. Once in the Network they found the Artifacts: enigmatic structures, millions of years old, left by a vanished race. Incomprehensible to both human and non-human minds, the Artifacts seemingly defy natural law.
Now, after millions of years, a new Artifact has appeared. When a motley crew of human and alien scientists and adventurers set out to examine still more Artifacts, they should have considered the fact that some changes are more dangerous than others. . . .