Kaba class PitchDetector ed

class PitchDetector extends MidiSource
    var bh_midi: MidiEventBuffer*
    var frequency: f32
    var input: InPort
    var loud_enough: bool
    var name: string
    var out_changed: source
    var out_play_end_of_stream: source
    var out_read_end_of_stream: source
    var out_state_changed: source
    var out_tick: source
    var output: OutPort
    var pitch: i32
    var port_out: OutPort&[]
    var session: Session&
    var volume: f32

    # constructors
    func mut __init__()

    # functions
    func mut virtual process(out midi: MidiEventBuffer, buf: AudioBuffer)
    func mut virtual read(out midi: MidiEventBuffer) -> i32