Kaba class Sample ed

class Sample extends Object
    var buf: owned![AudioBuffer]
    var midi: MidiNoteBuffer
    var name: string
    var ref_count: i32
    var tags: Tag[]
    var type: i32
    var uid: i32
    var volume: f32

    # constructors
    func mut __init__(name: string, buf: AudioBuffer)

    # functions
    func mut create_ref() -> xfer[SampleRef]
    func get_value(key: string) -> string
    func mut set_value(key: string, value: string)