A version of Risset's bell using additive synthesis. There's a bug with the doneAction.

Risset Bell - take 1

SynthDef(
  \risset_bell,
	{ |freq=440, dur=4.0, out=0|
		var partial;
		
		partial = { |amplitude, rel_duration, rel_freq, detune|
			OffsetOut.ar(out, 
				EnvGen.kr(
					Env.perc(0.05, dur*rel_duration, amplitude*0.1, -4), 
					doneAction: 0
				) * SinOsc.ar(freq*rel_freq+detune)
			);
		};
		
		partial.(1, 1, 0.56, 0);
		partial.(0.67, 0.9, 0.56, 1);
		partial.(1, 0.65, 0.92, 0);
		partial.(1.8, 0.55, 0.92, 1.7);
		partial.(2.67, 0.325, 1.19, 0);
		partial.(1.67, 0.35, 1.7, 0);
		partial.(1.46, 0.25, 2, 0);
		partial.(1.33, 0.2, 2.74, 0);
		partial.(1.33, 0.15, 3, 0);
		partial.(1, 0.1, 3.76, 0);
		partial.(1.33, 0.075, 4.07, 0);
	}
).add;

a = (
	type: \note,
	instrument: \risset_bell,
	freq: 500,
	dur: 10.0
);
a.play;   // play the note