blablabla :
Hope this clears things up.
Originally posted by mike323
I'm gathering the most important thing it to make sure I have a healthy balance of sensitivity from the rim and head piezos. I hope to snag jman on aim someday...
Actually the rim piezos have nothing to do with PS. You can get PS to work on a single piezo drum.
Here is a little background information from one of Roland's patents that describes how Roland modules detect strike position. I think this is one of those situations where a picture is worth a thousand words. So, I decided to combine some of the figures from the Roland patent to form the figure below:
http://vdrums.com/forum/attachment.p...4&d=1225930687
As you can see from the figure above, the module measures the time between zero crossings for the first piezo pulse. If you read the patent you'll see that this is for the head piezo only. Anyway, the module expects a properly designed pad to produce a narrow pulse, for a strike near the rim, and a wide pulse, for a strike near the center of the pad.
If you can't trigger that "ringy" rim sound from your DIY pad, then it might be that your pad isn't producing an inital pulse that is narrow enough. If the piezo polarity is backwards, then your module might be measuring the pulse width of the second pulse instead of the first. Or, if the natural frequency of your trigger system is too low, then it may just be producing too wide of a pulse.
The impulse response, of your trigger system is determined by many things -- the diameter and tension of the head, the diameter and thickness of the piezo brass element, the diameter of the ceramic element, the damping properties of the trigger foam and the base foam, etc. Also, piezo's don't have a flat frequency response, but more like a bandpass response. So, higher frequncies could be attenuated if they are outside of the passband of the piezo you've selected.
Anyway, I did notice that you said you are using a 2" piezo on a 14" snare. Maybe try a smaller piezo and be sure to tighen the head down really tight since you are already starting with a drum that has a lower natural frequency than anything that Roland produces.
-SD-
Maintenant ça ne veux pas dire que ça n'est pas changé sur la TD-30 mais tous les autres modules cela marche avec 1 piezo pas deux... Mais on peut aussi l'obtenir avec deux.
Un autre exemple avec une belle image :
http://www.vdrums.com/forum/forum/advan ... al-sensing
