Pbindef pair random selection?

I would like to select random keys with keeping pair .
Is there any solution to do it ??
Below is test code.
Thank you.

(
////synth
(
//triSin//
SynthDef(\sin1, { | amp=0.3, freq=400 , sustain=2.2 |
var sig, env;

env = EnvGen.kr( Env.linen(0.01,sustain-0.02,0.01)    ,       doneAction:2);  
sig = SinOsc.ar( freq )   ;
sig =Pan2.ar(sig,0);
sig = sig * env * amp;
Out.ar( 0 , sig  );

}).add;
);

//Synth(\sin1, [amp:0.5 , freq:400 ,sustain:0.3 ] );

/////pattern
(
Pbindef(\pdef_sin,
\instrument, “sin1”,
\freq, Prand( [400 , 1000], inf ),
\sustain , Prand( [0.1 , 0.3 ] ,inf ),
\dur, Prand( [0.2 , 0.6 ] ,inf )
);
);

Pdef(\pdef_sin).play;
//Pdef(\pdef_sin).stop;
)

Hi,

probably easiest to use array keys

Wow , this is what i want.
Thank you speedy help."
In this case , “array key” is best!!
“Pkey” is also useful in other case.
Thank you Useful information!!

Below is revised test code with array key. I works well.
(
Pbindef(\pdef_sin,
\instrument, “sin1”,
[\freq,\sustain,\dur] , Prand([ [400 , 0.1,0.2],[1000,0.3,0.6] ] , inf ).trace,
);
);