JMJ / Elka Synthex Laser Harp by Soul Replicant
This is as close as I could get to the JMJ Laser Harp sound from 2nd Rendez-vous.
The audio preview contains the raw sound and a version with chorus (TAL-Chorus-LX) and reverb (UHBIK-A).
Tune the 1st OSC to C and the 2nd to F.
Set LFO to switched, LFO one-shot enabled, Env Retriggering to on.
Turn up Delay Mix to your liking.
If it doesn't sound right check your OSC tuning, Pulse-Width, Slew, LFO Rate, and Att1