glitch when looping a trimmed sample

I notice a glitch in my sample as it loops.. I do the following...

I have a one bar loop on a drum machine which is midi synced. I want to sample this loop, but not from the start as there are reverb tails i want to catch. So, i set my mpc to run in a 4 bar loop.

I press record and it starts and records four bars to an audio track and then stops. I go to the take in trim mode and press chop then slice and choose four slices. I hit edit and f2. I have experimented with different releases. Then i go back to the audio track, and insert slice 2 on every bar. But it does not loop smoothly! There is a little pause at the end of the bar i think. Maybe there is some kund of anti click fade applued to the slices?

Its important to me to divide the loop exactly and not do this by ear as there is no transients on the downbeat and the reverb tail needs to loop aroynd perfectly smoothly. Any suggestions would be welcome indeed

I like using the looper in overdub mode to catch the bars I want with the reverb tails wrapping around. It records synced to the sequencer so it works as an audio track. I tend not to use looped samples that are bars long withing a sequence, but I would assume it's something in your chopping that is making the loop glitch.

check your ADSR settings in the AMP screen in PROGRAM.

also, when you chop in TRIM make sure RELEASE is set to 0.

Also, did you used vertical zoom (up/down cursor) while chopping?

Bugfix wrote:Also, did you used vertical zoom (up/down cursor) while chopping?

No, but that shouldn't make a difference should it?
The sample is 4 bars long, and cut into 4 slices, so each should be exactly a bar long and so should loop ok. At least, that's what I've been assuming. I'm guessing there is an anti-click envelope being applied to each chop.

Audiotrack does not give exact 4 bar measure, it adds some space at the beginning. If you do automatic silce, you have to make sure sample is exactly 4 bars long in samples, based on 44100/ second.

Ush. I've heard it said that the timing is not sample accurate, so will a maths calculation for that give a perfect loop?

If I put a transient on the downbeat, cut I cut the space before the transient from the sample to give something thats exactly 4 bars?


I've yet to try the loop mode, it's starting to look like a much better idea than audio tracks....

Just make sure sample is trimmed well at the beginning on eye/ear, or check that http://www.musiccalculator.com/ it will give you an exact tempo based lenght of 1beat

+1 on the zoom in and out with the cursor, you may be making your chops on non-zero crossings.

if I need something to loop perfectly (with reverb tails) I use patterns.

can you explain a bit more about what you do with patterns?

e.g. you an have a 2 bar sequence with a guitar chord sample on the first beat. You set the sample to OneShot/Poly. If you have some reverb on, you will always get reverb trails when you loop the sequence. Now you make a pattern out of that so you could always have it in sync.

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getting back to your original post. Do you use the reverb on the drum machine or on the mpc?

In my original post i was recording from InThru to an audio track. the reverb comes from the drum machine. but after playing around some more Ive hit even more problems. audio tracks not only add space at the start, but the end is incorrect too. icant seem to record anything into a perfect bar loop in a way which doesnt require manual editing of the loop.
now am i missing something really obvious here? how do i record what i hear from the mpc main out, into a bar-length loop which i can trigger on the downbeat and nave it be exactly the same? i want to mix down what im hearing withiut having to piss around editing tnestart and end points of a loop by ear, that should clearly be unnecessary.

innovine wrote:In my original post i was recording from InThru to an audio track.

Not sure why you use InThru when you can just record directly to the audio track.

icant seem to record anything into a perfect bar loop in a way which doesnt require manual editing of the loop.

If you mean you want to record a sample that is equal to one bar (by using an audio track) and then play the sample looped perfectly, then, bad news, that ain't gonna work, you can't record perfect looping samples with the mpc.

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The one-bar loop that you want to record, does it have to have the reverb tails play right away when triggered?

(Normally the reverb tails kick in only after a few milliseconds of audio has been played)

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For now I can suggest the following:


1) Go to REC mode on the mpc
2) Play the drum loop from the drum machine (just one bar)
3) Stop the recording only after the reverb tails have played through

Now take this sample, set it to ONE SHOT (POLY) and stick it into a one-bar sequence at the beginning.

When you now play the sequence looped you're going to have the drum loop playing with the reverb tails and without the glitch.

Now you can convert the track to a pattern for the ease of use.

I see what you're getting at, and it might provide a workaround, but the real issue is still not really solved.

Let me try ask a slightly different question..

What is the best way to have audio go out of the MPC, through external FX, and resample it back into the MPC so it is perfectly aligned with the original sound?

By 'best way' I mean as few button presses and tweaks as possible. I want to do this for basically all my sounds, so you can understand why it's very annoying to have to readjust the start position on all the resampled audio all the time.