Hi everyone,
I'm trying to patch waveguide wind instruments in Pd and need some building blocks:

1. a nonlinearity (waveshaper with transfer function x-x³)
2. a phase inverter
3. a way to create a zero/low-latency, time-variable feedback delay line

Any ideas?

Kind regards

1. Maybe I'm missing something, but doesn't a [pow 3] work? You could pass your signal trough [abs~] to make sure it is raised to the 3rd power properly, and use the following to correct polarity:

[>~ 0]
|
[*~ 2]
|
[-~ 1]

2. Isn't this the opposite sign of a signal? Doesn't a [*~ -1] do the trick?
3. Put a [delwrite~] in a subpatch, and a [delread4~] in another subpatch. Connect the two (first subpatch connects to second). Put both subpatches in another subpatch and put a [block~ 1] in there. Send the output of [delread4~] to a [tabsend~ feedback] (or whatever name the table it will write to is called). Connect a [tabreceive~ feedback] to [delwrite~].

@alexandros
it could very well be that these objects work. Being a pd-rookie, all my patches are dependent on external help. Thank you very much.