Knowledge Base

Frequently Asked Questions Product Manuals Firmware History

My app doesn't match my hardware. Do I have to calibrate it?

In most cases, you can use the app without calibration but to guarantee the 1/10th cent reading, we've added a calibration feature in the app. This is a one time process per installation. This process will not need to be repeated unless the app is deleted and reinstalled.

To calibrate iStroboSoft and your device:

  1. Open iStroboSoft and tap the bottom right-hand corner

  2. Tap "Clear Sweetener/Temperament" and tap "OK"

  3. Tap "Tuner Settings", then "Advanced Settings", then "Calibrate Tuner"

  4. On your PC or Mac, use a 440Hz test tone to calibrate your app. We recommend using the tone generator on our website. Hover over the TOOLS topbar menu item, select Frequency Calculator, then select 440Hz in the bottom slider, and press PLAY TONE.

  5. The test tone will now start to sound A440 Hz from your computer's speakers

  6. With the tone A4 playing at a moderate volume, on the app press "Calibrate NOW" and when its done, press OK

  7. Go back to the tuning screen by tapping the arrow at the top left of the display.

  8. The app is now calibrated to the phone, this is a one-time operation and does not have to be repeated.

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How do I read a strobe display?

Basically, the strobe image appears to travel to the left if your instrument is flat of the desired pitch and to the right if it is sharp. On earlier models such as the StroboStomp 1, StroboStomp 2, VS-1, VS-II and V-SAM, the strobe image travels upward if your instrument is sharp and downward if your instrument is flat of the desired pitch.

Adjust your instrument until the pattern is as close to still as possible. Strobe displays are 'real-time' and extremely precise. They require very fine tuning adjustments to stop the display because the frequency/pitch of any instrument is never totally stable.

You'll quickly learn to read the display, make the most precise adjustments and appreciate the high resolution that only a Peterson provides.

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I only have a Lightning port for audio. Can I use the Pitch Grabber or Peterson adaptor cable with my device?

Yes. You can use the Apple Lightning-to-audio adaptor with this accessory for guaranteeed connectivity.

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Can I create and store my own presets?

No. The iStroboSoft presets are configured at the factory.

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Is the accuracy the same for all Peterson tuners?

Yes, the accuracy is within 0.1 cents (1/1000 of one semitone) as with all Peterson Strobe Tuners. An important thing to note is that Peterson Strobe Tuners have ultra high definition displays, so not only are they highly accurate in detecting a note but they have the ability to display that accuracy. Other products claim accuracy but do not have the high definition screen to display the level of accuracy in which they claim. If you cannot see the accuracy, it is of little value. Only Peterson provides High Definition Strobe Tuning.

How Accurate Is My Tuner?

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Are the in-app options also available for Android?

At this time, Harmonic Tuning, Spectrographs, Oscilloscope, Extended Frequency, and some Sweeteners are only available for the iOS release of iStroboSoft.

These features will soon be available on Strobe™ (Android).

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What is my iStroboSoft’s Sweetened Tunings feature all about?

A Sweetener is a set of cent offsets or a deviation from generic Equal Temperament interval spacing traditionally used in tuning. Tuners made by Peterson, including the iStroboSoft, contain many choices of Sweeteners, in other words, several presets with differing interval spacing relevant to the instrument being tuned. If you’ve never been happy with how your instrument tunes up with your present tuner, a Sweetener could be just the thing to change that without any modifications whatsoever. The iStroboSoft offers 76 (In-App Purchase) unique and very accurate tweaks which often make all the difference.

Peterson Tuners - Sweetened Tunings

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How accurate is my iStroboSoft?

Your iStroboSoft is accurate to 0.1 cent (1/1000th of a semitone). It’s important to note, that unlike other tuners which list the detection accuracy as the main specification, the iStroboSoft detection AND display accuracy is 0.1 cent due to its high definition display.

How Accurate Is My Tuner?

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Can I share In-App upgrades across my devices?

Yes. As long as your devices are using the same iTunes account. This is possible. NOTE: If you have Family Share enabled on your account, you may not be able to do this.

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Where do I enable the harmonics upgrade?

Holding your device in portrait mode, click the arrow in the bottom -left of the screen to open the tuning panel. Go to the top of the panel and select TUNER > MODE > HARMONICS from the drop-down.

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Can I use this app with the iRig/iRig2 or Apogee Jam?

Yes. These devices are compatible with iStroboSoft.

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How do I allow access to the built-in mic on my device?

SETTINGS (on your iPhone/iPod/iPad) > PRIVACY > MICROPHONE. Enable the slider to allow access.

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I need to delete the app off my iOS device. How can I do that?

Delete the iStroboSoft app from your device by holding the icon down until a red "X" appears in the top-left. Tap the "X" to delete the app from your device.

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I already purchased iStroboSoft but I need to download it again. What do I do?

The App Store or Google Play Store will allow you to re-download iStroboSoft at no charge as long as you are using the same account as when the original purchase was made.

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How do I restore my In-App purchases?

In-app content will always need to be reinstalled with any app update as that is the way the App Store manages access. To re-enable your in-app purchases, go in the SETTINGS of the iStroboSoft app (bottom-right tab) > UPGRADES > RESTORE PURCHASES.

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I often tune my acoustic instrument in a loud environment. What's available to help with that?

If you are tuning an instrument with an output, you can use the Peterson adaptor cable to isolate your instrument from the environment. You can also choose to use the Peterson Pitch Grabber for acoustic instruments.

Pitch Grabber Mobile Tuning Clip

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Adaptor Cable for Mobile Devices

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What is the range of Hz calibration or Concert A calibration of my iStroboSoft?

The Hz calibration range of your iStroboSoft is 340Hz - 540Hz. The default setting is Concert A 440Hz.

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© 2025 Peterson Electro-Musical Products, Inc. No part or parts may be copied or reproduced without the express written consent of Peterson Electro-Musical Products, Inc. The terms Virtual Strobe™, Sweeteners™, Sweetened Tunings™ and the linear & concentric strobe patterns are trademarks/registered trademarks of Peterson Electro-Musical Products, Inc.

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