FM synthesizer built-in Teenage Engineering OP-1
See also here:Teenage Engineering OP-1 demo:"Weekly OP-1"
Vol.2: FM synthesizer test "Space noise"
youtu.be/gPAPVUvE864
The unmistakable sound of the OP 1. Nice drones.
@lagowski: I usually use a reverb plug-in built in Ableton S…