Kaba class AudioView ed

class AudioView extends Object
    var cam: ViewPort
    var sel: SongSelection

    # constructors
    func mut __init__()

    # functions
    func cur_vlayer() -> Layer&
    func cur_vtrack() -> void*
    func mut optimize_view()
    func mut unsubscribe(handler: Object)
    func mut update_selection()

    # nested classes
    class Layer
    class ViewPort