Timing test cable for use with Presentation and SCLA. Line level audio (source: Presentation) from tip of a male 1/8 in stereo audio cable to line level input (sound card line in) at tip of another male 1/8 in stereo audio cable. Trigger from bit 0 (pin 2) of DB25 male parallel port connector to (sound card line in) on ring of male 1/8 in stereo audio. Sleeve (ground) of both audio cards connected together along with pin 25 (ground) of parallel port. Connectors labeled as “SLI – Another PC”, “PP – Presentation PC”, “SLO – Presentation PC”.