could somebody confirm this bug?

1. Power on
2. Load any sample (long samples work better for this)
3. put the same sample on pad1 and pad2 (or any 2 pads)
4. put the low-pass filter on one of the pads
5. play both samples at the same time in one sequence (using quantitize)

outcome: It seems like sometimes the low-pass pad hits a little to late or to early, means that the
sequence sounds different from time to time.
---

This is how a lot of people used to put in more 'bass' in the track, it works in the akai os, I tested that!

not a bug. it's a phasing problem you're having. happens on all mpc's, i've had it happen on my 2000xl as well.

Mike Feedback wrote:not a bug. it's a phasing problem you're having. happens on all mpc's, i've had it happen on my 2000xl as well.

but it happens all the time using the JJOS, is there a way around that?

there's a few ways.

1) make a copy of the sample and invert it with a software editor, use that for the bass pad.

2) make a copy of the sample and adjust it's start point a little bit and use that for the bass pad.

3) time shift the bass pad so that they're not triggered at the same exact time.

the phase problem is simply that the samples are not really playing at exactly the same time, so what happens is one sample's waveform is above 0 at the same time the other sample's waveform is below 0 and the sounds essentially cancel themselves out at some frequencies. each of the methods i described will affect the waveform of one of the samples so that phasing could be eliminated.

this happens a lot if you're recording a single instrument with two different mics. if the distance on the mics isn't right, then one mic is picking up the same sound as the other, but their timing is a little bit off. some mic preamps actually have a phase invert button on them which automatically inverts the sound so that you can fix it prior to recording without having to adjust the position of the mics.

use 2 different samples. you'll end up happier with the result. stacking the same file just filtered is asking for trouble and you might as well just us EQ instead.

Antonym wrote:use 2 different samples. you'll end up happier with the result. stacking the same file just filtered is asking for trouble and you might as well just us EQ instead.

what do you mean by 'use two different samples'?
I kinda' have my problems with bass, or sub bass.


That 'stack the same sample' works perfectly on the sp-404 though!

That 'stack the same sample' works perfectly on the sp-404 though!

sometimes i really really really miss that thing. i'm about to ease the pain with a new daw though!

what do you mean by 'use two different samples'?
I kinda' have my problems with bass, or sub bass.

find a couple different bass sounds. i always start with a sine wav for one. then find a different bass that has some nice stuff going on in other frequencies than just the low - you could use something grungy, with a kind of burn in the upper freqs or a slap bass

simult these, tune them to the same note, adjust the volume levels, change the attack and decay, and do any filtering you want. you're far less likely to get phasing issues unless the sounds you chose have a lot of the same thing going on in the same frequencies - ie 2 different sub basses will interfere and phase.

antonym, i'm pretty sure he just has a sample that has bass in it and he wants to emphasize the bass by having one pad be filtered down to just the bass and playing it along with the original sample. he's not using bass tones and playing out his own bassline.

ahhh. yeah - eq in that case.

a quick way to solve it (kinda like eq) it to band pass or high pass the original sample and low pass the bass sample that will normally fix 90% of the problem, if u wanna keep it in the box!
Peace!

It's because the mpc is not sample accurate. It's triggering samples, not playing them from a time-line, therefore they aint going to hit at exactly the same point in time, hence phasing.