feedback - self oscilation devices / noise generators

[mathieu]

Hello all!
i was wondering about these things. i've been having a gaining interest in industrial bands like throbbing gristle, rasthof dachau, PPF, etc.
today i stumbled on this 'song' of them:
http://dl.dropbox.com/u/13769038/03%20untitled%203.mp3

around 0:46 it really sounds like self oscillating to me.
i am searching ways to make sounds like this. these small random loops. I made myself a noise swash who does a great deal. but i heard band like say wolf eyes can do this with broken tape machines etc. whats that all about?
i'd like some tips & tricks to make noise machines, let tape players feedback, etc.
i already wired 2 tape players from out to in and reverse, but i cant seem to get interesting feedback, mostly just a hertz absorbing drone.

also, bands like this often use som kind of distortion that sounds like its very damaged
http://dl.dropbox.com/u/13769038/02%20untitled%202.mp3 (the beats in this one)
are there diy effects to get some similar things going on.

I'm not looking to replicate sounds from this bands, i just like to get some way to gain nice results while experimenting. these sounds just trigger me to make this post

so if u guys know some devices in the vein of the noise swash, let me know!

thanks in advance!!

M

[crochambeau]

A lot of it is not the device or circuit itself, but how it is wired up and what else is in the chain.

That subject is incredibly open ended, and everyone will have a different approach. I like having a compressor (doesn't need to be "nice") in a feedback loop to rein everything in a bit, makes finding pockets and returning to them easier (for me). Everyone is going to have a different angle on this.

That particular track could have been anything, the time element makes me think there may have been a delay involved, possibly looping something that then tickled a feedback circuit that was more or less balanced at the point between heavily effecting signal and sustained oscillation.

But, it really could have been anything.

[ve3wwg]

A lot is done in software these days. For example if you use Cubase or Sonar (recording software) and a combination of VST effects, you can produce some wild sounds. It really amounts to how much time you want to sit at the computer for.

There are a ton of free effects. If you're not aware of these, try a visit to:

http://www.kvraudio.com/

Software is ok for filling a hardware gap when you need it. I do prefer to see the effects in hardware, when possible.