Ambient Cathedral Patch by spacedrifter1961 (youtube channel)

Berlin school Orchestral Reverb trails Ambient patch

Increasing the VCA Bias will hold the sound while adjustments can be made to the Time and Repeats on Delay. Noise can also be introduced. Adjustments can also be made to Oscillator 1's Shape. Best played through a reverb box such as the Strymon Blue Sky on max decay and mix.