# [ddots-l] Re: Scrubbing with Tranzport

• From: "Dan Rugman" <danrugman@xxxxxxxxxxx>
• To: <ddots-l@xxxxxxxxxxxxx>
• Date: Thu, 30 Nov 2006 18:46:56 -0000
Phil, I'm really sorry to be a nit picker but the word amplitude refers only to the maximum displacement of the wave form and not the individual points on the graph.
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In purely scientific tirms, the waveform shows either the displacement of the oscilator or the voltage coming from the microphone or to the amplifiers at various points in time.
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Mathematically speaking, the waveform shows you values between +1 and -1 and the amplitude multiplies all of these values.
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Zero crossing is in fact the point where the oscilator has a displacement of zero or the voltage in the circuitry is zero. In other words, the oscilator is in the rest position (like a still string on a cello) or there is no voltage in the circuits.
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Also, setting the grid to zero crossings will only help you to avoid sudden jumps in the waveform that cause pops and clicks. The only way to remove sudden changes in the audio quality itself is to crossfade between the material before and after the cut.
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Many apolagies for my finnicky snootiness, (that's what a maths degree does to you)
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Dan
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----- Original Message ----- From: "Phil Halton" <philhalt@xxxxxxxxxxx>
```To: <ddots-l@xxxxxxxxxxxxx>
Sent: Thursday, November 30, 2006 5:03 PM
Subject: [ddots-l] Re: Scrubbing with Tranzport

```
```Neville,

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If you are familiar with waveforms and how they look on a graph-for example, a sine wave, then... the zero crossing is the point where the wave crosses the x axis, or zero amplitude. So, zero crossings occur with every wave-that's alot of times in a given area of time. Perhaps thousands of times in a single frame. And, you don't find them-sonar does that for you using a setting in the snap to grid dialog. As for correcting glyches, I believe that is exactly what setting your from and to points at zero crossings will do for you. But again, you don't look for them, sonar finds them(the nearest ones to the from and thru times) when the checkbox for zero-crossings in the snap to grid dialog is checked. Read about these things in the help system.
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Disclaimer: I'm not an audio engineer so my terms might not be correct, but I believe the basic premise is. If I need correcting, please do so.
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----- Original Message ----- From: "neville" <neville@xxxxxxxxxxxxxxxx>
```To: <ddots-l@xxxxxxxxxxxxx>
Sent: Thursday, November 30, 2006 9:01 AM
Subject: [ddots-l] Re: Scrubbing with Tranzport

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How would one know where to find the zero crossing? Do they occur frequently in the wave or are they far and few. Can you fix the glitch that happens when you apply affects destructively by setting your from and through at zero crossings?
```thanks
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----- Original Message ----- From: "Phil Muir" <ddots@xxxxxxxxxxxx>
```To: <ddots-l@xxxxxxxxxxxxx>
Sent: Thursday, November 30, 2006 2:46 AM
Subject: [ddots-l] Re: Scrubbing with Tranzport

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It's the point where you can cut into a wave form, at the point of least resistance. E.G, if you apply edits at 0 crossings, then, you shouldn't get any pops and clicks, because there isn't much happening on the wave form at that point.
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Regards, Phil Muir
P J Muir Productions
Music And Audio Production
URL:
www.philmuir.com/
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----- Original Message ----- From: "neville" <neville@xxxxxxxxxxxxxxxx>
```To: <ddots-l@xxxxxxxxxxxxx>
Sent: Thursday, November 30, 2006 2:36 AM
Subject: [ddots-l] Re: Scrubbing with Tranzport

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```What are zero crossings?
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----- Original Message ----- From: "Gordon Kent" <dbmusic@xxxxxxxxxxxx>
```To: <ddots-l@xxxxxxxxxxxxx>
Sent: Wednesday, November 29, 2006 11:56 AM
Subject: [ddots-l] Re: Scrubbing with Tranzport

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It really is as simple as it looks. I personally never have a problem with zero crossings, but it depends on how fussy you want to get.
```Gord
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----- Original Message ----- From: "Phil Halton" <philhalt@xxxxxxxxxxx>
```To: "ddots-l" <ddots-l@xxxxxxxxxxxxx>
Sent: Tuesday, November 28, 2006 6:00 PM
Subject: [ddots-l] Scrubbing with Tranzport

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I've just installed sonar5.2, CT5.2 & the Tranzport. Everything is working fine(thanks for asking). Regarding Scrubbing audio with the Tranzport--is it really as simple as it appears? I mean, Wow, what a difference. I can't find anything on scrubbing with a control surface in the documentation, but it seems like all you do is Scrub with the Stop/Play/Wheel, set the F9&F10 points, select the region and edit as you like. Is that it? Anything else I should know? How about zero crossings--does that happen automatically when you set the F9&F10 from and thru points?
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One other thing-when scrubbing, I get this weird noise over the audio-sounds like space aliens or something. Should I be getting that? Any suggestions?
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