normally people fix that in samples, it is dc offset and below human hearing. maybe you might want it if you're playing to a specific sound system that goes lower than human hearing for physical effect, and you're willing to never have your music pressed on vinyl, but in practically every real world case it is best to just remove things people can't hear

 

yep

 

I don't understand, don't you get phase issue from those two different waveforms when mixed? (the sample + the 5hztone)

 

Just apply a lowcut to remove DC offset.

 

And 5Hz is a low frequency oscillation aka LFO , you did exactly the same thing as what I've descried earlier.

You need to have two signals to get that waveform so I'm perplexed by Goldbaby's explanation "amplitude modulation was probably introduced by hitting the sampling input on the SP1200 hard" I'm sorry to say that, but he just don't understand what he's saying.

 

Not when the other waveform is LFO, it just modulate the original signal. I thought it was explained like 3 times by now, no?

 

Last edited: Mar 1, 2025

bro this plugin is super mega iper ultra giga incredible. BIG UP !

 

Or didn't remember. "Just go stick it in your SP-1200".

 

No... phase is a relation between two waves and the "phase effects" like cancellation only happens when the waves are the near the same frequency. 5Hz and the rest of it (above 40Hz) are not close enough for phase to apply.

 

If it is external hardware 909, the kick is analog. So as you said, not only will one have variation from unit to unit; but from one beat to the next. It's why people will often record a longer loop than they actually need; to avoid it sounding like the "sampler mentality" that you mention. Most of the other 909 hardware clones kick will still be an analog sound source hitting the e-mu sampler's convertors. It's going to capture the sample and drop it to 12bit 26k. The very front of the sample could be a mixture of artifacts and a pretty hot transient at the very beginning of the sample.

I've never tried to copy a waveform down to a microscope level like this. I'd get it close to copied and do something different anyway. Otherwise I would just use the sample as is, and stick a clipper or a wave folder on top of it. Or a Transient designer. Load it into Kick 3 and fix it against another layer. The only place anyone is going to notice this is on a computer monitor.

Search for this on Sister Site: Mixing Kick and Bass with Protoculture. It's probably the best video demonstration of this I have seen using Kick2 to address phase alignment. It is detailed enough that it actually got boring.

 

Last edited: Mar 1, 2025

Maybe. But I assumed that the OP attached the picture of the waveform, how else would Goldbaby understand what the issue was?

Just one glance at the waveform reveals that the kick is affected by LFO, and not only by any LFO but by a sinewave LFO and it doesn't modulate amplitude but the waveform itself. Where the other signal comes from whether is was another downpitched kick, a self-resonating resonance or maybe even a standing wave in his room is open for speculations. AM can't be fixed with a lowcut filter, but this kick can be easily saved by removing the impact of added LFO.

 

The name of the initial sample is 909BD_SP1200F, don't you think he could just look at the file name and know what he did, to some extent?
It is from this pack: https://www.goldbaby.co.nz/sp1200c.html. Not the Tape 909 sample pack. So it should be safe to assume it was 909->sp-1200->recorded on "high end studio gear"; and then apparently processed further. We can't rule out an amount of clipping at the front of the waveform, because he could have easily just lowered the amplitude after the original sample was created.

He's asking about "perforation" at the front of the sample. If you look at the rest of the samples in the packs, even from the other machines he used; there is the same "dotted line" appearance to the waveforms. One usual suspect for it is bit reduction. His SP-1200 samples of various other machines show similar waveform. He also has filenamed the sample as F, and many others; so they are also likely tuned in the sampler. All this information is right in the filenames by design.

Now i'm actually curious if I will get similar results with a kick drum converted to 12 bit in the e6400 ultra, or if this mainly just an sp-1200 result. Probably not.

 

To some extent, yes he could. But I'm trying to imagine the conversation that would go something like

"Hey Goldbaby, you have a kick 909BD_SP1200F, there's some weird effect on it, how did you do that?"
"Hey OP, I just stuck it in my SP-1200"
"Oh, thanx, that explains it all. Or not"

It isn't all that helpful, that's just not an effective approach. At some point he had to see the waveform to see what the issue is. Why else would he come up with the AM explanation? But that explanation is wrong, there's no AM there thus my disappointment. After all Goldbaby's drum libs were on my harddrive when I started out and tried to figure out why thing sound the way they sound.

Yes we can, it has nothing to do with clipping. Clipping would just squared and distorted the waveform, there's no clipping that creates a perfect sinewave modulation. Although the picture 2, where there's just a single half-sinewave bump, that DC offset could be created by a bit reduction and similar sound manipulation.

 

Should have thot of this sooner. If you took a garden variety 909 kick and LAYERED a slow freq quick fading sine, you would achieve what's in the pic. Adjust to taste.