Yes, it was an MP3 player stack by a developer who went out of business. I don’t believe the stack was ever sold to another developer. It was created at a time when the RW universe was smaller and developers were really part-timers who did not depend on the income from stack development at all.
Nope, there were two developers in the SymfonIP group, and one would not let the other sell or even give the rights to their work, so when they split, the stacks/plugins died.