Tuning feedback delay line?

redmar

So I was trying to imitate the tuned delay line that some dsi synth have..for now I'm just trying to make a delay line at the end of a synth architecture and not to feed the delayed signal back to the oscillators mix. I was hoping to obtain a kind of 'guitar + amp feedback' sound.
Following this tutorial by Rob Hordijk for nord modular g1
[ http://colourofsound.8088.org/nord/data/DelayModule.html ] (almost at the end of the page)
I came out with this patch that kinda works (except for it messes things up after c#7), but I needed to tune the patch by ear (probably because the difference in the delay module), and I feel that the effect is not constant across the keyboard..so I'm wondering if there's a proper way to do this, and if that is possible on the G2.
Thanks for any help..(and excuse me for my bad english)!

FeedBack S.pch2

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Moody33 · Posted: Fri Nov 21, 2014 2:34 pm Post subject:

There is a comb filter module which can track your keyboard notes. The comb filter is a delay line...

Blue Hell · Posted: Fri Nov 21, 2014 5:10 pm Post subject:

You have a couple of delays in series .. every next one will add one sample delay, making the delay longer relatively for short delay times. Or the pitch being flat a bit.

You can replace the six delays by one, set to a delay time >= 6 * 5 ms. which would be 100 ms, or set it to 25 ms, which may be enough too for your purpose .. experiment a bit, and uou will have to retune a bit for that, the result would probably be better.

You'd still have to tune by ear tho, but thats just once.

Oh and on the NM Classic it was not perfect either.

Edit : I added two spaces to your post to make the URL work.

Edit : the NM classic delay is 2.65 ms ... so 6 * 2.65 = 15.9 .. meaning 25 ms for the single delay will be fine.

Edit: in fact for the NM Classic it would matter in what order you'd add the modules to the patch ... for the G2 that does not matter, it still matters though where they are on the screen, evaluation is top to bottom. left to right.

Blue Hell · Posted: Fri Nov 21, 2014 5:26 pm Post subject:

redmar · Posted: Sat Nov 22, 2014 6:04 am Post subject:

@ Moody33: thanks, didn't think about it. It does track perfectly the kb, but I don't get the sound I'm looking for, and I don't have control over the feedback path (low/hipass filtering, etc..).

@ bluehell: thanks for your inputs, I wish I was more skilled in dsp signals..I'll try what you suggest.
PS: finally I know how to use [url]..

Moody33 · Posted: Sat Nov 22, 2014 10:12 am Post subject:

redmar · Posted: Sat Nov 22, 2014 5:41 pm Post subject:

Ok,now i get it. I'll try that too.
Thanks again!

Tim Kleinert · Posted: Sun Nov 23, 2014 3:25 pm Post subject:

Other alternative is the string oscillator, which is a full-blown Karplus-Strong resonator with tuning-compensated HF damping.

varice · Posted: Sun Nov 23, 2014 5:09 pm Post subject:

redmar · Posted: Mon Nov 24, 2014 3:32 am Post subject:

redmar · Posted: Mon Nov 24, 2014 4:18 am Post subject:

I start thinking that the osc string could be my best option, even if more dsp-hungry..there is clearly a lot of possibility.

Thanks everyone for clearing-up my mind!