Freeze-a-like

[potul]

This is one of the things I want to try. I've always thad the FFT-IFFT option in my head, and I even tried to simulate it in the PC with some good results. The only drawback I see (without really having tried) is that it requires a big size FFT, and with the dsPIC I'm quite limited in memory, I can't really handle more than 256 points FFT.

[add4]

I'm quite certain that the FFT or DWT is the way to go for the freeze.. but i'm learning to make analog effect at the moment.. i'd love to build a DSP based effect later, but now that i have finished my thesis, i'm SICK of programming signal processing applications :p
And i have always worked on Matlab, never with DSPs... a lot of things to learn i guess.
Maybe later.
I'd love to hear from anyone who tries this approach

[DavenPaget]

You guys can try the

[slacker]

You can do a freeze effect using a reverb algorithm using 100% feedback and killing the input. I've done it on the FV-1 and it sounds pretty good.

[potul]

You can do a freeze effect using a reverb algorithm using 100% feedback and killing the input. I've done it on the FV-1 and it sounds pretty good.

mmm... interesting approach. Is it something similar to a Shimmer?

[slacker]

Here's an example of using reverb to do a freeze type effect, jump to about 4:10

.

[crane]

You can do a freeze effect using a reverb algorithm using 100% feedback and killing the input. I've done it on the FV-1 and it sounds pretty good.

+1 from me
I've tried this on a FV-1 demo board - took a while to get into spinasm, but the result was quite good... I think
Right now I'm developing a stand alone unit for doing this.
Here's my progress so far:

Let's see how it goes
Meanwhile >> HERE << is a link to a sample - it is not musical - sorry for that, but you can get general concept

[Hides-His-Eyes]

You can do a freeze effect using a reverb algorithm using 100% feedback and killing the input. I've done it on the FV-1 and it sounds pretty good.

+1 from me
I've tried this on a FV-1 demo board - took a while to get into spinasm, but the result was quite good... I think
Right now I'm developing a stand alone unit for doing this.
Here's my progress so far:

Let's see how it goes
Meanwhile >> HERE << is a link to a sample - it is not musical - sorry for that, but you can get general concept

Very good! Does one of the 'pots' control the hold function?

[slacker]

Very nice, sounds really good, mine needs some work but it proves the concept works. I guess you're using a switch connected to one of the pot inputs to control it?

If anyone wants to try this on the FV-1 or just get an idea of how it works, then Dave Spinkler's Reverb+HP+LP code here http://www.spinsemi.com/programs.php does infinite reverb, use a switch instead of the reverb pot, add a clean blend and you're good to go, that's what mine is based on/stolen from.

[crane]

Very good! Does one of the 'pots' control the hold function?

Yes, one of the FV-1's "pot" controls the hold function - but it I don't think that it is as simple as adding a switch to it. We'll see - I didn't add a switch on my development board, let's see how the real board turns out. I'm missing some components, otherway I would finish it tonight.
A pot in signal line controls level of the hold signal.
Dry signal does not go through FV-1 - it goes through a buffer (this is because a pedal like this cannot be true bypass  - I wanted mine to be at least good buffered bypass, so that the clean signal does not have to go throu ADC/DAC
If it runs out good I might be selling some pcbs.

[Scrutinizer]

Perhaps this will help: I get a freeze effect with my Axe-FX using delay algorithm that has four delays (the band delay), each with independent feedback path that can be set to 100% feedback.
http://wiki.fractalaudio.com/index.php?title=File:Band_Delay_block.jpg

The delay times are set to four randomly selected values between 100 and 200ms. I've tried this using only one delay line and it does not sound good - the loop point is very obvious. But with four delay lines, the loop point is well hidden.

I have had even better sounding freeze effect by using two of the blocks mentioned above .. for a total of eight delay lines, each with slightly different timing (between 100 and 200ms). This provides a thickly chorused freeze effect.