NodeDictionary : IdentityDictionary {
    getDefaultOr {
        | key, defaultValue |
        if(this[\defaults][key].isNil, {
            ^defaultValue
        }, {
            ^this[\defaults][key]
        });
    }

    processSig {
        | sig, gate |

        var releaseNode = if (
            this[\sustained].asBoolean,
            { 2 },
            { nil }
        );

        var envDoneAction = if (
            this[\sustained].asBoolean,
            { 0 },
            { 2 }
        );

        if(this[\useLfo].asBoolean, {
            var lfo = switch(this[\lfoWave])
            { \sin } { SinOsc }
            { \saw } { Saw }
            { \tri } { LFTri }
            { \pulse } { Pulse }
            ? SinOsc;

            signal = signal * lfo.kr(
                \lfoFreq.kr(1)
            ).range(
                1 - \lfoGain.kr(0.5), 1
            );
        });

        if(this[\useSaturation].asBoolean, {
            this.getDefaultOr(\saturationSteps, 4).do {
                signal = signal.tanh;
            }
        });

        if(this[\useEnv].asBoolean, {
            var att = this.getDefaultOr(\attack, 0.1);
            var rel = this.getDefaultOr(\release, 0.1);
            var curve = this.getDefaultOr(\curve, 1);

            var env = Env(
                [0, 0, 1, 0],
                [0, \attack.kr(att), \release.kr(rel)],
                [0, \attackCurve.kr(curve), \releaseCurve.kr(curve)],
                releaseNode: releaseNode,
            ).kr(envDoneAction, gate: gate);

            signal = signal * env;
        });

        if(this[\usePan].asBoolean, {
            switch(this[\panning],
                \splay, { signal = Splay.ar(signal, \spread.kr(1), center: \pan.kr(0)); },
                \splayAz, { signal = SplayAz.ar(this[\panningChannels], signal, orientation: \orientation.kr(0.5)); },
                \pan, { signal = Pan2.ar(signal, \pan.kr(0)); }
            );
        });

        if(this[\postAmp].asBoolean, {
            signal = signal * \postAmp.kr(1);
        });

        // if(this[\detectSilence].asBoolean, {
        //     FreeSelf.kr(
        //         DetectSilence.ar(
        //             [signal[0], signal[1]] + Impulse.ar(0)
        //         ).product)
        // });

        if(this[\limitDuration].asBoolean, {
            Line.kr(0, 1, \dur.kr(1), doneAction: 2);
        });

        signal = signal * \amp.kr(1);

        ^signal;
    }
}