feedback

spiderman · Post by **spiderman** » Thu Sep 18, 2003 5:07 am

just to learn a little , I tried to make feedback with the delay module.
on the delay mod i set a delay time , fdbck=0 , hdamp at no damp , dry=0 ,wet=max.
the out go to the xmod/feedback thing in and then it go to a modmixer where it mixed with the source signal. indeed the out of the mixer go to the in of the delay .

so in fact I recreate manually the delay feedback . but the result is not like as expected . the decay is strange , not as smooth as the implemented delay feedback and not as longer even with a max volume of re-injected signal .
somebody could explain me why ? any advices on feedback will be great !
thx

[ This Message was edited by: spiderman on 2003-09-18 07:36 ]

spacef · Post by **spacef** » Thu Sep 18, 2003 12:58 pm

what do you want to do with it ? you either want to reinject it in the first delay (mixed with dry, with a mixer before the delay), or you want to filter/eq the wet sound?

at0m · Post by **at0m** » Thu Sep 18, 2003 6:50 pm

I've posted a mini patch which demonstrates how to insert a filter in the feedback path of a delay.
Many filters attenuate the input signal a little, the 12dB module in that patch should allow more adequate feedback control.
The LFO-modulated cutoff frequency makes the feedback patch more evolving. The LFO can give a more live feel to the delay and helps ringing on high feedback settings.

spiderman · Post by **spiderman** » Fri Sep 19, 2003 7:16 am

yes I noticed the attenuation by the filter ; also it's seems there is a limiter in the mod mix.
thx for the post atomic ! it's exactly what I do , but without the 12db gain . in fact i tried to put a distotion in that place and it's way cool ! in front of the stereo delay line I put many delay "panned" that I use only for predelay .
but be careful ! with all this expermiment some time the sound goes very very VERY VERY LOUUDDDD an LOOOOOWWWWW

maybe I have to design some protection in the feedback loop to avoid speaker damage ?
so thanx for share ideas about feedback thing .

spacef · Post by **spacef** » Mon Sep 22, 2003 7:52 am

You can improve this patch by adding a second delay on the WET part of the first delay, and add filters between both delays.
delay1-->wet--> Insert---> second delay.
When you get distortion, you cut the Gain in your feedback loop, but it's smoother because it gets repeated by the second delay. It's easier to control the sound that way, with infinite feedback on the first delay and normal feedabck on the second. There are various inserts that can give you a very convincing old school dub sound (to put in the feedback loop or between the two delays)...
+ double delays are better

[ This Message was edited by: spacef on 2003-09-22 08:53 ]

spiderman · Post by **spiderman** » Mon Sep 22, 2003 8:09 am

thanx spaceF for your clever tips !! great !
for now I have put a limiter in the feedback loop . I think about a vca and then manage to do an "auto regulated" feedback etc ..

spacef · Post by **spacef** » Mon Sep 22, 2003 8:29 am

a limiter ? interesting. Looking forward to see the patch when it's done...

spiderman · Post by **spiderman** » Mon Sep 22, 2003 8:51 am

yes ! i'll post it as soon i'm happy with !
I use the limiter like a stage gain ( the 12dbgain atomic talk about ). so it boost the feedback but avoid the feedback goes too loud. I will try with a VCA to modulate the feedback level . Maybe something interesting could happen ?

spacef · Post by **spacef** » Mon Sep 22, 2003 9:53 am

with a vca you can get something good.I did a device with the auto-release function and you can almost do the same in the Modular (my dev not available yet so don't look for it)

[ This Message was edited by: spacef on 2003-10-10 17:56 ]