A dusty tape full of creaks, hisses and squeaks swooped down at HDK headquarters a while ago. Its author, one who calls himself "the Prince of Darkness" (sic), remains a mystery. On the tape minimal sounds, limping scores, silences full of anguished expectation, short instrumental excerpts that have the flavor of foggy and humid winter evenings, of the soil of ancient cemeteries, of loneliness, of putrefaction and decay.HDK has delighted and entertained you with orchestral soundtracks, accompani…