SEATTLE — It’s been nearly a year since Thomas Dausgaard’s abrupt departure as the Seattle Symphony’s music director, but the projects initiated under his tenure and delayed by the pandemic continue to make their way to the Benaroya Hall stage. The latest of these is Antiphaser, a concerto for electric violin and orchestra by the Mexican composer Enrico Chapela. Trading his 1709 “Scotta” Stradivari for an electronically amplified instrument, Pekka Kuusisto joined the orchestra to perform the world premiere under the baton of Andrew Litton on Nov. 3.