[PD] click sound when saving

Jaime Oliver jaime.oliver2 at gmail.com
Wed Jun 29 09:01:39 CEST 2011

Hi Roman,

Indeed DC...

It was an oscillator with uninitialized frequency and its own dac that
I put in a sub-patch to get reference pitches and forgot about it



On Tue, Jun 28, 2011 at 5:59 AM, Roman Haefeli <reduzent at gmail.com> wrote:
> Hi Jamie
> Am I right in thinking, that you get this click even while all your
> audio modules are silent? At least, that is what the click.wav file
> suggests.
> I assume there are two things involved that cause the clicking:
> * When doing "a lot" within 0 logical time, you'll get audio drop outs,
> because the computer is not fast enough doing the requested task in the
> defined time frame (which is: your buffer size). This often happens
> while loading or saving presets.
> * It seems one or more of your audio modules contain a bit of DC
> ('direct current' or constant) in their signal. Make sure to avoid that
> whenever possible, since DC decreases the dynamic range available and
> makes your amps and speakers consume a lot of energy without any
> benefit.
> Now, if you really have a certain amount of DC going to your [dac~] and
> there is a drop-out (see reasons above), this will be audible, because
> during the drop-out the signal switches to 0 and after the drop-out back
> to the DC level. I think that is the reason for your clicks.
> For a quick test, you could put a [hip~ 5] right before the [dac~] and
> check if the clicking still occurs. A high-pass filter will remove any
> DC components from the signal, but the better solution would be not to
> generate a DC in the first place.
> Roman
> On Tue, 2011-06-28 at 04:00 -0700, Jaime Oliver wrote:
>> Hi all,
>> I have two patches.
>> One is my "stable" version and the other is the "development" one.
>> They are similar, but I've made many changes.
>> However, this development version now makes this click sound (attached
>> or in www.jaimeoliver.pe/misc/click.zip)
>> The click happens when editing, saving or sending control messages to
>> the audio modules. Deleting the audio modules eliminates the problem,
>> but I need those.
>> Anyone has any idea where to look for possible problems?
>> best,
>> J
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Jaime E Oliver LR


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