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Tunelab Piano Tuner

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Tunelab Piano Tuner TuneLab Piano Tuner FOR ANDROID 1. What is TuneLab Piano Tuner? 1 - basics and definitions of terms used in later chapters. 2. Normal Tuning Procedure 10 - your first tuning with TuneLab. 3. The Tuning Curve 15 - what it is and how to modify it. 4. All About Offsets 19 - four different kinds of cents offsets used by TuneLab. 5. Over-pull (Pitch-Raise) Tuning Procedure 21 - how to make a pitch raise more accurate. 6. Calibration Procedure 24 - to ensure absolutely accurate pitches. 7. Historical Temperaments 27 - unequal temperaments for period music, or for modern development. 8. Working with Tuning Files 29 - how to select files & folders for saving tunings. 9. PTG Tuning Exam 33 - how to capture a master or examinee tuning, detune, and score the exam. 10. Split-Scale Tuning 36 - (Classic tuning mode only) how to tune poorly-scaled spinets. © 2019 Real-Time Specialties August 2019 (734) 434-2412 version 2.4 www.tunelab-world.com Chapter What is TuneLab Piano Tuner for Android? 1 TuneLab is software that helps you to tune pianos. This form of the software runs on Android devices with Android 4.0 or later. Other versions of TuneLab are also available for iPhone/iPad/iPod Touch devices and for Windows computers. There are other manuals to describe these other forms of TuneLab, and they can be found on our web site at tunelab-world.com. This manual describes only the Android version of TuneLab. Visual Tuning TuneLab is a software program that turns an Android device (phone or tablet) into a professional Electronic Tuning Device, which provides a piano tuner with real-time visual guidance in tuning. The sound of a note as it is played is picked up by a microphone and analyzed. The results of the analysis are displayed in visual patterns. TuneLab displays two main visual patterns - the phase display and the spectrum display. Both of these displays indicate if the pitch of a note should be raised or lowered, but each display has its own unique advantages. Seeing both displays simultaneously gives the piano tuner the best of both worlds. Note Selection Terminology In this manual we will be referring to notes on the piano by note name and octave number. For example, A4 is the A above middle C. Each numbered octave runs from C up to the next higher B. So the lowest complete octave on a standard piano is octave 1, and it includes C1...B1. The notes below that are A0, A#0, and B0. The highest note on the piano is C8. Notes that are sharps or flats will always be designated as sharps. So, for example, we write A#0, not Bb0. Phase Display The phase display is the horizontal band shown here. This display is used for fine tuning. The black squares move to the left if the note is flat and to the right if the note is sharp. The closer you get to the correct tuning, the slower the black squares will move. The goal is to make the black squares come as much to a stop as possible. If the piano string has any false beats the black squares may appear to move in an irregular fashion, sometimes moving back and forth. When there is no note playing, or when the note being played is far from the correct pitch, the black squares will disappear or move randomly. This display is called the phase display because it displays the phase of the sound from the microphone as compared to the phase of an internally generated reference pitch, and is therefore similar to listening to beats. Using the phase display gives the most precise measure of the pitch of a note. 1 Spectrum Display The spectrum display is the graph shown here with the zoom set to ±50 cents around the desired pitch. This display can be configured for other zoom levels. This display shows how the sound energy is distributed across the frequency spectrum. If TuneLab is listening to a pure tone, then the spectrum graph will show a single peak, as shown here. This example was made from the note C6, which happened to be about 3.8 cents flat. The red line in the center of the display marks the correct pitch. The green lines nearest the center mark the points that are 10 cents above and below the correct pitch. The objective in tuning with the spectrum display is to tune the note until the peak of the graph is centered on the red line. The spectrum display has several advantages over the phase display. One is that it shows where the pitch of the piano is, even when that pitch is far from the correct pitch. The other advantage is that the spectrum display can show several peaks at once. The picture here shows what you would get when playing a poorly tuned unison. Here the piano note C6 is being played with one string tuned nine cents higher than the other two strings. In this display the zoom has been set to its most zoomed-in level, ±50 cents. By looking at individual peaks it is possible to do a rough tuning without mutes! You simply tune one of the strings and watch which peak moves, then move that peak to the central red line. In addition to zoom levels of “wide”, ±260 cents, ±130 cents, and ±50 cents, the spectrum display can also be zoomed in on the center ±10 cents in the center of the display, while still showing ±130 cents or ±260 cents overall. When one of these “dual-zoom” modes is selected, the numbers at the bottom of the graph show offsets in cents rather than frequencies in Hz. The picture shown here is of one such setting of the spectrum display showing two simultaneous notes - one at C6 and the other at C#6. This picture also illustrates the use of the “Wide spectrum traces” option in Settings. A faster way to change the zoom setting is to use a two-fingered pinch gesture in the Spectrum Display itself. One advantage of the phase display is that it generally provides more resolution than the spectrum display, except in the highest octave where the resolutions of the two displays are about the same. For this reason the spectrum display is used for rough tuning and the phase display is used for fine tuning. False beats can confuse the phase display, though. So you may prefer the spectrum display even for fine tuning in the highest octave. In any case, both displays are available; so you can use whichever display seems to be giving the clearest indication. 2 Action Bar (top of Main Tuning screen) At the top of the Main Tuning screen there is button for Help and a button for the Files menu. Use the File menu to load and store tuning files, to start a new tuning, and to switch to and from Dropbox cloud storage for tuning files. The Help button shows help for items on that screen. Look for a Help button at the top of most other screens in TuneLab too. Command Buttons (bottom of Main Tuning screen) This button switches to the view of the tuning curve and the deviation curve. The tuning curve shows a graph of the stretch offset for all notes, and the deviation curve analyzes selected intervals for the bass and treble. On this page you can adjust the tuning curve to achieve an appropriate amount of stretch tuning for the particular piano. See “Adjusting the Tuning Curve” in chapter 2 for more information on the tuning curve. This button starts a measurement of inharmonicity, which is needed when you create a new custom tuning. After pressing this button, play the selected note and hold it for up to six seconds. You should have all but one string muted so that TuneLab hears a single string. You need to measure at least four and preferably five or six notes in order to establish the inharmonicity pattern for the particular piano. After the measurements are made, you can adjust the tuning curve to match them, or just let the tuning curve be adjusted automatically. This button turns on locking mode. In this mode, TuneLab listens to the sound from the microphone and tries to adjust the offset to match it. You can see the offset changing and you can see the phase display and the spectrum display indicating an in-tune condition. This is used for matching an offset to an existing tuning to measure an existing tuning or to establish a non- standard offset for a tuning. Be sure to turn off locking mode promptly when the sound stops, otherwise TuneLab will continue to try to lock to noise, resulting in a random offset. The offset produced by locking mode can be reset to zero by tapping on the offset display. This button switches to sound-generating mode. In this mode TuneLab generates a tone in the speaker or headphones, rather than listening to the microphone. This is not generally used for tuning, but it can be useful for chipping after restringing a piano. This is the Settings button, and it switches to a list of various settings and configuration actions, such as loading and saving tuning files, doing a calibration, configuring the spectrum display, and controlling auto note switching. This image appears in place of a command button when a mode has been entered that needs to be able to end. This button will stop inharmonicity measurements, locking mode, sound- generation mode, calibration, and over-pull mode.
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