[PD-dev] snake_in~ tutorial?

[Alexandros Drymonitis]

I want to experiment with the new Pd feature of the 
[snake_in~]/[snake_out~] objects, specifically with [snake_in~]. In Pd's 
source files (in d_misc.c) I read the following in [snake_in~]'s dsp 
routine:

```
static void snake_in_tilde_dsp(t_snake_in *x, t_signal **sp)
{
     int i;
         /* create an n-channel output signal. sp has n+1 elements. */
     signal_setmultiout(&sp[x->x_nchans], x->x_nchans);
         /* add n copy operations to the DSP chain, one from each input */
     for (i = 0; i < x->x_nchans; i++)
          dsp_add_copy(sp[i]->s_vec,
             sp[x->x_nchans]->s_vec + i * sp[0]->s_length, sp[0]->s_length);
}

```

There is no perform routine, so my question is, how do I deal with snake 
signals in a perform routine? How do I unpack them? Where is this 
happening in Pd's source code, so I can have a look?