as @deadsy said the midi note value is converted to a 'float' (blue) already.
from here you have 2 choices.
a) derive the phases mathematically
b) convert the note to an integer (green) , then a bit of maths an use it as input into a mux8 to select the appropriate value, which you can set on each of the i0 to i8 inputs
(a) works well when you want to do lots of values
(b) is a bit easier then its a limited set of notes you want to do (which seems to be the case here)
note: there may be objects in the community library that help you do this, especially things like scaling - but I do not use, so perhaps someone else can suggest, or you'll need to dig a bit
experience in PD will help you a lot for how to patch, especially in structuring patches.
however, the first thing to recognise is Axoloti patching is different in the way it works
pure data is event driven, i.e. objects fire message from one to the next.
axoloti is data driven, so data constantly flows between objects.
think of a physical modular synth, the inputs have a value (voltage) at all times, not in response to something happening.
this is why there cannot be a select in axoloti , since every wires always has a value... you cant change the way the signals flow - initially this may feel odd/counter intuitive, but its not really, its just different.
ok, that may be a bit technical/and difficult to explain in one short paragraph,
but the upshot is, sometimes you might have to approach the problem in a different way to how its done in PD.