Maybe a silly question but do know a way to use < > == in pd for signal.

I do not want to use expr~ as it is GPL and i want to use libpd

Hello,

I am trying to build a lfo to control the cutoff frequency of the filter.

[inlet~ signal]
I
I [inlet cutFreq]
I |
I | [inlet range]
I | |
I | | [inlet~ lfo]
I | | I
I | [*~]
I | I
I [+~]
I I [metro 1]
I I |
I [snapshot~]
I |
I | [inlet resonance]
I | |
[pd filter] (1.signal,2.frequency,3.resonance)
I
[outlet~]

I try to explain my problem with examples.

Ex:
Inlet frequency : 10 HZ
Range: 10000 HZ
LFO: 2 HZ

So it means, in one second the frequency goes from 10 to 10000 HZ two times.

The sound is ok so no problem for 2 HZ lfo, i also can't hear any sound below 30 hz so a little silence occurs when lfo set the frequency below 30 hz which is ok.

But!!

Inlet frequency : 10 HZ
Range: 10000 HZ
LFO: 10 HZ
In one second the frequency goes from 10 to 10000 HZ ten times.

But it sounds is like it is waving between 3000-8000 HZ so the sharp cut off moves can not be achieved with high hertz. The problem starts to begin with the lfo hertz goes up to 3 Hz.

I tested in some software synthesisers it can do even without a problem at 20 HZ

So what is the problem, where should i look? Is the problem is snapshot?, at 10HZ one cycle will 100ms and the resolution should be 100 for metro 1 ms which should be ok. I am missing something! any help would be great.

Note: LFO is sine wave and the inlet signal is 50 harmonics falling saw wave.

Thank you in advance.

Thank you great!

thank you both, i will look into that