PedalPCB's Low Tide Modulator : input stage saturates ?

[Nicotep]

Just finished a (rather ambitious) build of PedalPCB Low Tide Modulator, introduced as a "mock up" of Fairfield Circuitry's Shallow Water.

The result is like 80% ok : controls respond well and seem to correspond to what they should do. BUT...
The input quickly saturates (quickly like : even with a Telecaster as a source), even when the Mix knob's full CCW. Which makes me think the problem is coming from the input stage. But I admit it's complicated for me to identify the trouble.

The people at PedalPCB kindly gave me the schematic. Here's the link : https://www.pedalpcb.com/docs/LowTide-Schematic-PedalPCB.pdf
The input stage shows a 2SK208-Y (which I suppose is meant to buffer the input), followed by a 2N3904 which distributes the signal to different places (gate / BBD / mix).
Could it be one of these transistors not OK with the signal input ?
I'm asking help because the 2SK208-Y is SMD (there are through-hole pins provided too next to it) and it's not gonna be so easy replacing it.

thx

EDIT : fixed it. Replaced the 2SK208-Y with a J201. All ok now.