Delay inside GenExpr operators

Hi All,

I've been trying to get the delay and history operators to work inside a custom GenExpr operator/function definition within a codebox, but I'm not having much luck. The same code works fine as long as I don't try to package it as a function. Has anybody else managed to get something similar to work? I'm wondering whether this a limitation of the language at the moment, or whether I'm using the wrong syntax.

The definition looks like this:

AP(in_AP,delay){

Delay delay_1(8, interp="linear");
tap1_2 = delay_1.read(delay, interp="linear");
float_3 = float(0.618034);
mul_4 = (tap1_2 * float_3);
add_5 = (in_AP + mul_4);
mul_6 = (add_5 * float_3);
add_7 = (mul_6 + tap1_2);
out_AP = add_7;
delay_1.write(add_5);
return out_AP;
}

-J