tuba_valves/Fingering.py

from load_asset import load
from math import log
import convert_to
device  = load('device')
#cents between notes
def cents(f1,f2):
    
    return 1200*log(f1/f2,2)

#fingering based off of valves or slide
def fingering(note,dev,_a = 440):
    dev = device['devices'][dev]
    fund = convert_to.frequency(convert_to.above_c(dev['fund']))
    sys = device[dev['sys']]
    
    f_note = convert_to.frequency(convert_to.above_c(note),a =_a)
    n = int(f_note/fund)
    t = abs(cents(f_note,n*fund))
    if t >= 31:
        n += 1
    if n == 7:
        n += 1
    try:
        return sys[round(convert_to.frequency(n*fund,invert = True,a = _a)) - convert_to.above_c(note)]
    except IndexError:
        return 'Note too damn low'