Any new opcode is welcome, but I think a nested allpass filter is not enough
generic, I think the basic idea os a delay line inside another delay line ,
something which is not possible with the current deltap/delayw implementation,
would be more interesting as a general tool. I suggested something like a tapw
opcode some months ago, to inject audio signals inside a delay line, this could
do the job, or maybe making the delayw opcode linked to a particular delayr
unit, something like

atemp1 delayr itime1;main delay line
(...)
atemp2 delay itime2;inner delay line
(...)

delayw (...),atemp2 ; write (...) into atemp2 - if atemp1 is not present it
should work as the existing delayw unit
delayw (...),atemp1 ; write (...) into atemp1


Hans Mikelson wrote:

> Hi,
>
> I have a version of nested all pass filters working but it only allows
> i-rate parameters and no initial delay.  If I make the parameters k-rate the
> cannot be optional as far as I know.