Kaba class Synthesizer ed

class Synthesizer extends Module
    var active_pitch: i32[]
    var auto_generate_stereo: bool
    var delta_phi: f32[128]
    var events: MidiEventBuffer
    var freq: f32[128]
    var input: InPort
    var instrument: Instrument
    var keep_notes: i32
    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 port_out: OutPort&[]
    var render_by_ref: bool
    var sample_rate: i32
    var session: Session&

    # constructors
    func mut __init__()

    # functions
    func mut virtual create_pitch_renderer(pitch: i32) -> xfer[PitchRenderer]
    func mut virtual on_config()
    func mut virtual read_audio(port: i32, out buf: AudioBuffer) -> i32
    func mut virtual render(out buf: AudioBuffer)
    func mut virtual reset_state()
    func mut set_instrument(i: Instrument)
    func mut set_sample_rate(sample_rate: i32)