sccode = """
SynthDef.new(\\swell,
{|amp=1, sus=1, pan=0, freq=0, vib=0, fmod=0, rate=1, bus=0, blur=1, beat_dur=1, atk=0.01, decay=0.01, rel=0.01, peak=1, level=0.8|
var osc, env;
sus = sus * blur;
freq = In.kr(bus, 1);
freq = [freq, freq+fmod];
amp=(amp / 4);
freq=(freq + [0, 1]);
freq=(freq * [1, 0.5]);
osc=VarSaw.ar(freq, width: SinOsc.ar((rate / ((2 * sus) / 1.25)), add: 0.5, mul: [0.5, 0.5]), mul: [1, 0.5]);
env=EnvGen.ar(Env.perc(attackTime: 0.01,releaseTime: sus,level: amp,curve: 0), doneAction: 0);
osc=(osc * env);
osc = Mix(osc) * 0.5;
osc = Pan2.ar(osc, pan);
	ReplaceOut.ar(bus, osc)}).add;

"""

synth = SCInstrument(
    shortname="swell",
    fullname="Swell",
    description="Swell synth",
    code=sccode,
    arguments={}
)