Hi, i'm new to PD
for a project i'm working on (i want to validate an idea before making it in hardware)
i want to create a LP/HP filter with a switch for changing the filter type (LP/HP)
and a multiple switch (4 position) to change the slope from 6db 12db 18db and 24db
for both LP and HP. Just this as a starter.

This is my starter patch

Thank you in advance for any help

i want to validate an idea before making it in hardware

Beware there are differences in analog and digital world.
Pd is probably not the right tool for this. Better use analog circuit simulation, such as LTspice?

https://forum.pdpatchrepo.info/topic/13409/how-can-i-create-a-switchable-filter/3

https://forum.pdpatchrepo.info/topic/13621/20-mode-pole-mixing-and-morphing-filter-updated

@Urbanspaceman I would suggest using [biquad~] as its behaviour can be changed through messages... and those messages can control the slope as well as the frequency and gain.
You will need [lowshelf] and [highshelf] from the ggee library to create the messages.
You will not need to switch between objects using [biquad~]
If you later want a bandpass / notch option then get [equalizer].... also from ggee.

But as @lacuna says, you will not gain any real insight into your analogue design..... if you mean analogue hardware.
There should be plenty of circuit designs for analogue sub-woofer/main speaker filters with switchable slope for high-fi..... going back nearly 100 years.
Your choice will be passive (resistance, capacitance, inductance) or active electronic.... or valves if you want to get fancy.
Or code for a microprocessor...... there are a few examples on the www.
David.

a digital poles and zeros filter always offers 3 or 6 db/oct, depending on the use case, and you switch to a higher order by switches and gates which lets you choose to put filters in series or not.

this is more or less identical in both worlds.

if you actually want to use a "multiple switch" (i.e. many switches) to do that on a hardware surface is another question (you rather want to have a switch with 4 stages) but the internal logic in the circuit is always the same.

you *can *use a digital enviroment to design circuits which look *similar *to electric components, but of course one prerequisite would be that you *know *these analog components already. (and then it is questionable why you would need a computer program to simulate it?)

i am not really a pd user and i dont know which distribution has what gate and switch objects - but we can easily replace it using multiplications with 0 and 1.

this way it is even simpler to understand what happens.

Thank a lot to all
i don't want to make a 1:1 simulation, i just want to test if my idea is a good idea or if it's bad
no matter if the sound is the same, i want just validate some concept while away from the lab before to breadboard it

U.