Fork Code: FxChain class

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FxChain { 
    classvar <>numSpeakers=2; 
    classvar <>server;

    var <>fadeInTime,<>level, <>fadeOutTime, <>out, <>group;
    var <in, <fx, bus, <gain;
    var fxGroup, gainGroup;

    *new {|fadeInTime=1, level=1.0, fadeOutTime=1, out=0, group|
        ^super.newCopyArgs(fadeInTime, level, fadeOutTime, out, group).init;
    }

    init { 
        server = server ? Server.default;
        bus = List.new();
        fx = List.new();
        group = group ? Group.new;
        bus.add(Bus.audio(server, numSpeakers));
        in = bus[0];
    } 

    add {|... args|
        var synth, p, name, params, inbus, outbus;
        name = args[0];
        bus.add(Bus.audio(server, numSpeakers));
        inbus = bus[bus.size-2];
        outbus = bus.last;
        params = args[1];
        p = [ \in, inbus, \out, outbus ] ++ params;
        synth = Synth.tail(group, name, p);
        fx.add(synth); 
    }

    addPar {|... fxList|
        var inbus, outbus, synths;
        bus.add(Bus.audio(server, numSpeakers));
        inbus = bus[bus.size-2];
        outbus = bus.last;
        fxList.postln;
        fxList.do({|i, idx|
            var synth;
            if (i.class==Symbol) {
                var name = i, params, p;
                if (fxList[idx+1].isArray){
                    params = fxList[idx+1];
                };
                p = [ \in, inbus, \out, outbus] ++ params; 
                synth = Synth.tail(group, name, p); 
                synths = synths.add(synth);
            }; 
        });
        fx.add(synths);
    }

    play {
        var gainBus;
        if(fx.isEmpty){ 
            gainBus = in 
        }{
            gainBus = bus.last
        };
        gain = NodeProxy.new(server, \audio, numSpeakers, gainBus);
        gain.play(out, numSpeakers, group, vol: level, fadeTime: fadeInTime);
    }

    free {
        gain.clear(fadeOutTime);
        SystemClock.sched(fadeOutTime, {
            group.free;
            bus.do(_.free);
            in.free;
        });
    } 
}

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