ok, it looks like they are: "Cutoff", "Reso", "Filter LFO":

1. So can I use "Alps RK12L12C0A0E" as a replacement? - they have 15A taper -> they are
logarithmic - Are you sure? I ask, because the 3 others are linear.
2. For the
boost poti: I don't find Bourns PTV09A-1025F-B102 --> only PTV09A-4225F-B102 (can I take these as replacement therefor?)
they are
linear, right?
PS: With that middle number 1025F, I can only find these "logarithmic" ones: "PTV09A-1025F-A203" <--- but these are not the right ones, right?
Please, I need more details about these both potentiometer types...
Greetings,
rio