continuous hi-hat control with mididings

from mididings import *
from mididings.engine import *
from mididings.event import *

class HiHatController:
    def __init__(self):
        self.pedal = -1
        self.open = 1;
        self.close = 0;
    def __call__(self, ev):
        if ev.type_ == CTRL and ev.param == 4:
            self.pedal = ev.value
            print "pedal ", self.pedal
            if ev.value < 20:
                self.open = 1
                self.close = 0
                return None
            elif ev.value >= 35: #  <--- questo probabilmente va abbassato a 30
                self.close = 1
            if self.open == 1 and self.close == 1:
                self.open = 0
                self.close = 0
                print "banzai!"
                return [
                    NoteOffEvent(ev.port, ev.channel, 39, 127),
                    NoteOffEvent(ev.port, ev.channel, 40, 127),
                    NoteOffEvent(ev.port, ev.channel, 41, 127),
                    NoteOffEvent(ev.port, ev.channel, 42, 127),
                    NoteOffEvent(ev.port, ev.channel, 43, 127),

                    NoteOffEvent(ev.port, ev.channel, 46, 127),
                    NoteOffEvent(ev.port, ev.channel, 47, 127),
                    NoteOffEvent(ev.port, ev.channel, 48, 127),
                    NoteOffEvent(ev.port, ev.channel, 49, 127),
                    NoteOffEvent(ev.port, ev.channel, 50, 127),
                ]
        elif ev.type_ == NOTEON and (ev.note == 37 or ev.note == 44) and self.pedal != -1:
            var = ev.note
            if(self.pedal < 1):
                ev.note += 6;
            elif(self.pedal < 5):
                ev.note += 5;
            elif(self.pedal < 10):
                ev.note += 4;
            elif(self.pedal < 20):
                ev.note += 3;
            elif(self.pedal < 35):
                ev.note += 2;
            elif(self.pedal < 85):
                ev.note += 1;
            print "note in=", var, " out=", ev.note
        return ev

run([
        Filter(NOTEOFF) >> Discard(),
        Filter(NOTEON|CTRL) >> Process(HiHatController())
    ] >> Velocity(gamma=0.75)
)