since you’re already into Euro, the most flexible/cost-effective/readily-available way would be a pair of Doepfer phasers, plus an envelope follower module if you don’t have one.

they have several options, but the best-sounding one to me (from clips) is the new A-101-8. it’s based off the phaser used on so many Kraftwerk/krautrock albums and thus has a very familiar feel. they’re fairly inexpensive ($135-155 new) bc they’re BYO modulation, which is great for your purposes!

the patch should be pretty self-explanatory; just a tip that if you only follow one side of the stereo signal (or a sum) and feed that to the CV inputs of both, you’ll have smoother modulation, though you may want the more dramatic effect!

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