I'm doing a Reverse-FX. This patch has a 4000ms delay line and a vd~ that reads that delay line using a phasor~ at double speed forward... to play backward the input.

The problem is, if it use 1000ms, it's ok. But, when phasor~ reads less lenght parts of the DL, a "pop" sound appear at every loop.

I tried to put a [+~ 1] before vd~, to avoid using the very first sample, but nothing.

There's another workarround, using one of the two "pop-muters" that appear in the patch. They make a little fade out and in. One using vline~, and the other, maths (thanks ClaudiusMaximus). But, maybe it mutes the pop sound... but mutes the audio too. I would want not to use them.

How do fix it?

Thanks.

EDIT: the file has a 2 seconds array, to test the patch. Because of that is the file size.

http://www.pdpatchrepo.info/hurleur/reverse-clicks.pd

Those pops are just going to happen because the delay line is of limited length. Once you get to the end, the [phasor~] will wrap around to the other end of the delay line, which has unrelated audio.

For a smoother transition, you'll want two [vd~]s, each reading from the same delay line, and have a crossfade between the two when the end is reached. You can offset your original [phasor~] using [+~ ] to create the second look-up signal for [vd~].

Someone from IRC told me to make something like that, to use two vd~ and crossfade them. Well... as I have a lot of job with other parts of the project and there're only 3 or 4 FXs that uses this reverse effect, I'll keep in mind to fix it in the future.

Thanks!

thanks for this Mario. was looking for a way to do reverse delay.

I prepared two patches for you, mod, using your FXs and some modified ones.

• fx-del-rvs.pd
• fx-del-rvs-fb.pd (with feedback)

I'm glad of helping you!
(Well, I can't believe that)

http://www.pdpatchrepo.info/hurleur/reverse-delays.zip

You can easily modify the pitch shifter in the G09 example patch to do this. I made it into an abstraction, which is attached.

I'd like to extend this to use randomized window sizes, so that the resulting amplitude modulation is less regular. I got part way through making that, but got distracted by other things.

http://www.pdpatchrepo.info/hurleur/pitchshift~.pd