openframeworks osc fade controller

//--------------------------------------------------------------
void ofApp::setup(){
    oscSender.setup( "192.168.0.12", 9001 );

    slider.addListener( this, &ofApp::sliderChanged );
    gui.setup( "Parameters" );
    gui.add( slider.setup("faders", 0, 0, 255) );

    ofSetWindowTitle( "OscOF" );
    ofSetWindowShape( 300, 150 );

}
//--------------------------------------------------------------
void ofApp::contador(){

//    ofxOscMessage m;
//    m.setAddress( "/ch1/set_alpha" );
//    m.addIntArg( t );
//    oscSender.sendMessage( m );
    //contador



}


//--------------------------------------------------------------
void ofApp::update(){

    //contador();


    float phase = 1 * ofGetElapsedTimef(); //* M_TWO_PI;
    float value = sin( phase );

        kx = ofMap(value, -1, 1, 0.0, 255.0);


}

//--------------------------------------------------------------
void ofApp::draw(){
    gui.draw();
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){

    if ( key == OF_KEY_RETURN ) ofSaveScreen( "screenshot.png" );

    if(key == 'a'){
//    ofxOscMessage m;
//    m.setAddress( "/ch1/set_alpha" );
//    m.addIntArg( kx );
//    oscSender.sendMessage( m );

    }

}