The dismissal of its principal oboist, Liang Wang, and associate principal trumpet, Matthew Muckey, is on hold while the union investigates, but the musicians are on unpaid leave. “The orchestra said in a terse statement only that after it had received reports that the two players had ‘engaged in misconduct,’ it retained Barbara S. Jones, an attorney at Bracewell and a former federal judge, to investigate. An orchestra official said the investigation took five months.”