IPO trackers expect a jam-packed schedule this week.

But of the initial public offerings in the works, only DynaVox, a provider of speech-generating software that helps people with language and cognitive disabilities, is standing out.

It would be the busiest week this year if all begin trading. Of seven offerings expected, however, six are expected to start trading on Thursday. DynaVox is scheduled for Wednesday.

That means a slew of IPOs will have to compete for limited investor funds, not a promising harbinger for first-day performance, says IPO analyst Scott Sweet of IPOBoutique.

DynaVox, based in Pittsburgh, hopes to raise about $150 million before expenses. It is getting strong buzz on Wall Street, analysts say.