Noob : busses and groups question

Questions
1

Hi,
in order to understand busses and groups mechanism, I’m trying to setup a simple synth and an fx and would like to choose wether the synth is going through the fx or directy to the output 0 (aka dry signal)
here is the code, but i can’t hear anything through the speakers
I’m missing something but i can’t see what’s wrong with this code

(s.waitForBoot {
	//busses
	s.newBusAllocators;
	~delayBus = Bus.audio(s, 2);
	~dryBus = Bus.audio(s, 2);

	s.sync;

	//groups
	~synthGroup = Group(s);
	~fxGroup = Group.after(~synthGroup);
	~dryGroup = Group.after(~synthGroup);
	s.sync;

	// declare synths

	SynthDef.new(\source, {
		arg freq = 400, amp=0.5, env_rate=0.7,
		out=0;
		var sig, env;
		sig = SinOsc.ar(freq)!2;
		env = EnvGen.kr(
			Env.perc(releaseTime:0.2),
			LFSaw.kr(env_rate)
		);
		sig = sig * env * amp;
		Out.ar(out, sig);
	}).add;

	//declare dry synth
	SynthDef(\drysignal, {
		arg in= 0, out= 0, amp= 0.9;
		var snd;
		snd = In.ar(out, 2);
		snd = snd * amp;
		Out.ar(out, snd);
	}).add;


	//declare fx
	//allpass delay
	SynthDef(\allpass_delay, {
		arg maxdelaytime = 0.3, delaytime = 0.25, decaytime = 6;
		var sig;
		sig = In.ar(\out.kr(0), 2);
		sig = AllpassN.ar(sig, maxdelaytime, delaytime, decaytime);
		Out.ar(0, sig);
	}).add;
	s.sync;

	//delay
	~delay = Synth.new(\allpass_delay,[\in, ~delayBus],~fxGroup);
	// dry signal
	~dry = Synth.new(\dry,[\in, ~dryBus, \out, 0],~dryGroup);
	s.sync;

	s.plotTree;
});


//synth
(
//can run this multiple times
~synth = Synth.new(\source, [
	\out, ~delayBus,
	\env_rate, 0.5,
	\freq, exprand(200,2000),
	\amp, 0.25
], ~synthGroup);
)

thanks for your help

2

There are two typos here.

~dry = Synth.new(\dry, [\in, ~dryBus, \out, 0],~dryGroup);

\dry is not the name of the synthdef you want, you meant \drysignal.

and…

sig = In.ar(\out(0), 2);

That line should read…

sig = In.ar(\in.kr(0), 2);
3

oops, my bad!
code is fixed thanks Jordan