C4 is not in the script or block logo schematic. It's there for a little hiss attenuation, I believe. To defeat the feedback loop and make the phaser portion more script like, you can just remove either C7, C8, or R16. But really, the regen pot dumps all the feedback signal to ground when you turn full CCW. so you won't really hear any difference by removing components versus just turning the regen all the way down.
Removing C4 might bring a little brightness in.
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