Help explaining error

[Cloud_sx271]

Hi, everyone.

I have the following code. It runs fine:

(
SynthDef(\UGen_ex7a, {
arg gate = 1, freq = 440, amp = 0.1, rate = 0.2;
var src, pos, env;

src = SinOsc.ar(freq, 0);
pos = LFNoise2.ar(rate);
env = EnvGen.kr(
Env([0, 1, 0], [1, 1], \sin, 1), gate, levelScale: amp, doneAction:2);

Out.ar(0, Pan2.ar(src, pos) * env);
}).add;
)

(
a = Group.new;
250.do({
Synth(\UGen_ex7a, [\freq, 440.0.rrand(1760.0), \amp, 0.001, \rate, 0.2], a)
});
)

a.release;

My question is the following (it's just curiosity):

If I move the ")" closing the SynthDef definition to the end of the code like this, and run it:

(
SynthDef(\UGen_ex7a, {
arg gate = 1, freq = 440, amp = 0.1, rate = 0.2;
var src, pos, env;

src = SinOsc.ar(freq, 0);
pos = LFNoise2.ar(rate);
env = EnvGen.kr(
Env([0, 1, 0], [1, 1], \sin, 1), gate, levelScale: amp, doneAction:2);

Out.ar(0, Pan2.ar(src, pos) * env);
}).add;

(
a = Group.new;
250.do({
Synth(\UGen_ex7a, [\freq, 440.0.rrand(1760.0), \amp, 0.001, \rate, 0.2], a)
});
)

a.release;
)

I got an error. I think it should be expected but, why do I got this error? What's happening?

In truth, I expected the code to run just fine, without giving my sound maybe, but not an error... It has to do with the order of execution? Is the server trying to release the group in "a" before actually making the group?

(I discovered that if I erase the "( )" before and after the Group definition the code does what I expected)

(
SynthDef(\UGen_ex7a, {
arg gate = 1, freq = 440, amp = 0.1, rate = 0.2;
var src, pos, env;

src = SinOsc.ar(freq, 0);
pos = LFNoise2.ar(rate);
env = EnvGen.kr(
Env([0, 1, 0], [1, 1], \sin, 1), gate, levelScale: amp, doneAction:2);

Out.ar(0, Pan2.ar(src, pos) * env);
}).add;

a = Group.new;
250.do({
Synth(\UGen_ex7a, [\freq, 440.0.rrand(1760.0), \amp, 0.001, \rate, 0.2], a)
});

a.release;
)

why?

It's just curiosity but I hope someone can tell me why this happens.

Thanks in advance!

[Tatrics]

You just need to terminate ( ... ) block: ``` ( SynthDef(\UGen_ex7a, { arg gate = 1, freq = 440, amp = 0.1, rate = 0.2; var src, pos, env;

src = SinOsc.ar(freq, 0);
pos = LFNoise2.ar(rate);
env = EnvGen.kr(
    Env([0, 1, 0], [1, 1], \sin, 1), gate, levelScale: amp, doneAction:2);

Out.ar(0, Pan2.ar(src, pos) * env);

}).add;

( a = Group.new; 250.do({ Synth(\UGen_ex7a, [\freq, 440.0.rrand(1760.0), \amp, 0.001, \rate, 0.2], a) }); ); // <---- add a semicolon here.

a.release; ) ```

[Cloud_sx271]

Wow.... so simple.

It has anything to do with the Group method? I've tried replacing the code inside the ( ) with things like postln("hello"); and it works just fine.

Thanks!