Hi there, i have a flanger guitar effect and I remember that when the battery was almost empty it started making, for a few moments (till the battery died), very interesting and unpredictable noises responding to what i was playing on my guitar. I was wandering if it would be possible to write such an effect in pd and simulate that "lack" of voltage.

yendrrek

someone posted a really nice effect mimicking a broken tape player on the pd list a little while back, you might be able to get similar sounds with that:

http://lists.puredata.info/pipermail/pd-list/2007-12/058000.html

(here is the file, btw:

http://lists.puredata.info/pipermail/pd-list/attachments/20071219/675ac54a/attachment.zip )

Thanks hardoff, I´ll give it a try.

@yendrrek said:

Hi there, i have a flanger guitar effect and I remember that when the battery was almost empty it started making, for a few moments (till the battery died), very interesting and unpredictable noises responding to what i was playing on my guitar. I was wandering if it would be possible to write such an effect in pd and simulate that "lack" of voltage.

yendrrek

You could also build a really simple voltage starving circuit for the pedal in question. This is a really popular thing with pedal modders.

@nestor said:

You could also build a really simple voltage starving circuit

Show us please !

• __battery___ -
  | |
  ---/\/\/\/\/\/\/\--- 10k wirewound potentiometer
  | ^
  | |
  pedal

But this will also drain the battery

I think there's a more sophisticated way using a variable voltage regulator like LM317

Ehh... any means of transforming this into pd speak?

Not really, because the low voltage affects analogue pedals mostly and there isn't a way to describe this digitally without very hard analysis (running the whole schematic in pspice).

Likely results from undervoltage transistor and op-amp circuits are different kinds of distortion.

For bucket brigade delay lines there will be an increase in noise, like a kind of soft quantisation error noise.

Obi, that's actually basically it, just use it with a decent wall wort. Starving transistors can lead to under or oversaturation I suppose.