I watched the video and understood that for perfect timing I need to get notes with their beginning right to the gridline. OK. It worked. But then I checked out carefully and noticed, that some notes I already had by the gridline. Still they moved to one bar ahead or back, also placed by gridline. Well, why they moved.. ? Does it have anything to do with time signature, or what.. ?

What exactly did you do to make the notes move? You don't specify which video you followed, but I'm going to assume you Quantized the notes in GB's Piano Roll Editor to auto-correct their timing by moving them to the nearest gridline. If that was the case, then I'm going to assume that what probably happened is that you used a Quantization grid that was too widely spaced, so notes were moved to the nearest gridline allowed by the chosen Quantization grid. For example, if you had some notes that fell on, say, consecutive 16th-note gridlines, but you Quantized using an 8th-note grid, then the notes that were already on the 16th-note gridlines that fall in-between the 8th-note gridlines would be moved to the nearest 8th-note gridlines, which may not have been what you intended. When using Quantization it's important to select the best grid value for that particular situation, otherwise notes may be moved to the wrong gridlines. Now, I can only guess if that's what happened in your case because you weren't specific about how you applied the Quantization. I can't really explain Quantization any more clearly without demonstrating, so it you haven't already seen it, watch this video from the GarageBand 101 Absolute Beginner's Guide course to see how it's done in GarageBand: https://www.macprovideo.com/video/garageband-101-absolute-beginners-guide/22-22-quantizing-your-performance?afid=E470KLQ7r9\ But there are still a few things to keep in mind -- see the next post..

Over & above what the video linked in the previous post shows, there are still a few things to keep in mind when using Quantization: - Quantization is meant to auto-correct the timing of notes played in in realtime from a keyboard -- it's not meant to be used on notes you pencil in, which you can just manually place wherever you want them to be in time - Quantization is not a cure-all -- it doesn't always work as you'd like or as you intend it to, and with some performances it can make things worse - The Quantization grid you select must be based on the timing of the performance -- it must be at least equal to the fastest-played notes in the performance. So if you played 16th-notes, you cannot use a Quantization grid of less than 16th-notes, otherwise it'll move some of the notes to gridlines where they don't belong -- this is what I guessed might have happened to you - Even if you select the best Quantization Grid value, it may still move some notes to the wrong gridline -- if a note is actually closer to the wrong gridline rather than the one you meant to play it on, then the note will be moved to that wrong gridline. This is just the way Quantization works, and the only way to fix that kind of thing is [after Quantizing] to move such notes by hand - If you try to get fancy and use multiple Quantization values, it can get confusing -- don't over-use it

So you wrote the quantization grid must be equal to the fastest note I have recorded? Do the quantization grid is a selected note under time quantize? I thought that to choose a note value of quantization must be by the notes which are mostly recorded ones. I mean, if I have recorded mainly 1/4 notes, but have some or one 1/8-1/16 notes recorded, so I have to choose for time quantizing 1/16 note (from that list under time quantize)? Although most notes are 1/4?

Yes, the Quantization grid should be at least equal to the fastest note(s) recorded. So in your example -- mainly 1/4 notes, but some or 1/8 & 1/16 notes recorded -- you should choose 16th-note Quantization. If you tried to Quantize that example to, say, a 1/4-note grid, it would move all the 1/8 & 1/16 notes to 1/4-note gridlines. completely and unintentionally changing the musical part you created. But if you Quantized it to 16th-notes then all the notes would be moved to the nearest 16th-note gridlines -- as long as none of the notes were played closer to the wrong gridlines than to the right gridlines, then all the notes would be properly Quantized.

I enclose three videos. First one how the notes move a bar back, although they were aside the gridline ( I don't remember, maybe I have penciled them in to piano roll. If so, what happens if I use the time quantization in case of penciled in notes? ). https://youtu.be/7s51JO0az3A Then I watched the video you provided, and there he says on 00.50 that "click down on the region and the notes already will be selected". In his video, yes. In my gb, no, only region is selected, the notes stay still not highlighted. https://youtu.be/avMx_amZPjc Finally, you wrote that if I don't use a metronome then I can't do time quantizing of midi keyboard notes'. But that's not true. You see a metronome is off, I record with midi keyboard and then can do time quantizing. But I have Catalina. Maybe you can't do it in Mojave... ? https://youtu.be/k2S9AJNdasA

You wrote that if I choose quantization grid 1/4, although there are 1/8 notes, it will completely and unintentionally changing the musical part I created. Well, but it's not definitely a bad thing... ? If I like changings more than original, I'll let it stay so.. ? I mean, I can try different quantization grids which of them are suits me best, correct.. ?

Well, I suppose you could deliberately play with Quantization like that though that's certainly not its intended purpose. Most musicians I know carefully avoid letting (straight) Quantization change the musical part they played other than simply tightening up sloppy timing -- in fact, many people Quantize to less-than-100% Strength (the slider below the Time Quantize menu), so the Quantization will subtly tighten up their timing but have as little musical effect on the performance as possible.

You wrote about the slider below the time quantize menu (strength), but I don't have this one. Could you please also answer to my post dated apr 27th 02.46? It's 3 posts back. Thank you!

1. If you pencil in notes then it doesn't make sense to use Quantization -- there should be no need to Quantize. If you want the notes you pencil in to fall on the bar/beat gridlines [which is what Quantization will do] then just place them right at the bar/beat gridlines as you enter them. In the video you appear to have notes placed at what appear to be random locations in time -- did you you do that deliberately because you wanted those notes to sound exactly where they are relative to the bar/beat grid [though they appear to NOT have any specific timing relationship with the grid], or did you just ignore the gridlines when you dropped in those notes? In other words, is there a musical reason why the notes are specifically placed where they are in the video, and are they in fact placed at specific times RELATIVE to the GB bar/beat grid for musical reasons..? 2. Even though GB isn't highlighting the notes when you select a Region, if a Region is selected and you use Quantization, all the notes in that Region will be Quantized. However, if you have one or more notes selected -- either in the selected Region or in another Region -- then ONLY the selected notes will be Quantized. It may not be immediately intuitive, but that's how GB works.. 3. You misunderstood what I was saying. I didn't say you can't Quantize notes when the Metronome is turned off -- you can perform Quantization whether the Metronome is switched on or off. What I said was that if you don't PLAY IN TIME with the Metronome then you won't be able to USE Quantization AS INTENDED -- to auto-correct the musical timing of notes by moving notes that fall A LITTLE off-beat onto the nearest bar/beat gridlines. If the notes -- for whatever reason -- have no relation to the musical gridlines, then Quantization will just randomly move them to the nearest [unrelated] gridlines, which would serve no useful purpose. In the videos you seem to be randomly experimenting with Quantization, without trying to achieve a specific result -- to take a musical performance that was played/recorded IN TIME with an audible Metronome [with notes that all fall CLOSE to the musical bar/beat gridlines] and then automatically move the notes SLIGHTLY onto the nearest [intended] musical gridlines, for tighter musical timing, making the notes line up exactly with the musical grid of the bar/beat ruler. 4. The Quantization Strength option is only present in Region view. There are two tabs in the Piano Roll Editor for MIDI/Instrument tracks -- Region and Notes. Whenever there are no individual notes selected, the Piano Roll display automatically shows Region view -- all notes in a selected Region are affected by Quantization, and the Strength slider is available. But if you manually select an individual note [or notes] in the Piano Roll Editor, then the display automatically switches to Notes view, which does not include the Strength option, and only the selected note[s] are Quantized.