> > > axv0 = axv1
> > > axv1 = axv2
> > > axv2 = axv3
> > > axv3 = axv4
> > > axv4 = axv5
> > > axv5 = axv6
> > > axv6 = axv7
> > > axv7 = axv8
> > > axv8 = axv9
> > > axv9 = axv10
> > > axv10 = ain/igain;
> >
> > [...] replace your delay line with one that has its taps at every sample,
> > not every ksmps samples. Try it with the delay1 opcode. 
>  
> ?? 
> I'm using a-rate for the filter
>  

Roger, I'm afraid there is a big misunderstanding! (Hope it's not on my side.)
The a-rate operations in Csound code are _not_ executed every a-rate cycle.
They are executed every k-rate cycle, but apply to a _vector_ of values.
(The dimension of this vector is ksmps.)

Jens