[PD] easy effects?

[Derek Holzer]

Hi Josh

[plugin~] can be tricky or just a plain pain the wazoo to use simply 
because it can crash when given the wrong creation arguments, such as 
the  name of a plugin that doesn't exist on your computer. Of course, a 
help patch which crashed on anybody's computer should be a high priority 
to fix, but maybe not everybody around here seems to agree with that ;-) 
I posted about this problem in 2005 and still it hasn't really been 
dealt with.

[plugin~] requires the path to your LADSPA directory to be set as the 
LADSPA_PATH in the environment. Look up "setting environmental 
variables" plus either "bash" or "shell" on Google to see how this is 
done if you don't know how.

If you use the terminal command "listplugins", you should see a list of 
the LADSPA plugins on your system. You must use the exact name listed 
there, for example, if "listplugins" gives you:

/usr/local/lib/ladspa/noise.so:
         White Noise Source (1050/noise_white)

then you would use [plugin~ noise_white]. (Somebody correct me if this 
is wrong, I am not on a Linux system where I can check this for the next 
several days...)

Then, you need to send the proper control parameter number, and NOT the 
control parameter name. For example, if sending the message "info" to 
the plugin lists the following to your Pd window via [print]:

Loaded from library "/usr/lib/ladspa/mvclpf24.so".
Control input(s):
  #1 "Input gain (dB)"
  #2 "Frequency"
  #3 "Exp FM gain"
  #4 "Resonance"
  #5 "Resonance gain"
  #6 "Filter poles"
  #7 "Output gain (dB)"
Control output(s):
Audio input(s):
  #1 "Input"
  #2 "Frequency"
  #3 "Exp FM"
  #4 "Resonance"
Audio output(s):
  #1 "Output"

Then you would have to make a message "1 $1" to send a variable to 
control the input gain from a number box or slider.

More info on LADSPAs in general:

http://linuxdevcenter.com/pub/a/linux/2001/02/02/ladspa.html

If somebody would like to make a chapter on this in the Pd FLOSS Manual, 
I would jump for joy. I just haven't had the time to do it myself. Feel 
free to copy paste from this email and make some screenshots! ;-)

You can also search for "plugin~" in the list archives and find much 
discussion on this. The two threads I started were called "plugin~ 
ladspa" and "setting plugin~ control inputs" in about 2005, when I was 
trying to figure this all out.

Best!
Derek



On 3/17/10 6:22 AM, Josh Lawrence wrote:
> On Tue, Mar 16, 2010 at 8:26 PM, hard off<hard.off at gmail.com>  wrote:
>> http://puredata.hurleur.com/sujet-1982-diy2-effects-sample-players-synths-sound-synthesis
>
> well, I guess it just doesn't get any easier than that!
>
> thank you hardoff.
>
> I'm also assuming that ladspa is out of the question?
>

-- 
::: derek holzer ::: http://macumbista.net :::
---Oblique Strategy # 167:
"Use cliches"