波動 Hysteric Oscillator26.9.16 - App Store

An oscillator experiment app that shows the waveform in real time while it plays.

Generate sine, square, pulse, sawtooth, and noise from 2 Hz to 20 kHz, and control the filter (low-pass / high-pass) and AM / FM modulation from your device. Export what you made as a video or an audio file. Useful for quick speaker and amplifier checks, DIY audio circuit tests, and learning synthesizer basics.

Features
- Six waveshapes: sine, square, pulse, sawtooth, harmonics, and noise (White, Pink, or Brown)
- Real-time waveform display with L / R in separate colors; tap to switch to a mono trace
- Spectrum analyzer: see the frequency content in real time, with guide lines on each harmonic so you can read how much harmonic content the sound has
- "Harm" waveshape built from added harmonics: pick which harmonic is loudest with a slider, then set the character with Pure / Full / Odd / Even, and check the result in the spectrum
- Frequency from 2 Hz to 20 kHz, with exact numeric entry
- Filter: off / low-pass / high-pass, with resonance (Q) and slope (-12 to -48 dB/oct)
- AM modulation with five modulator shapes; pulse lets you set the beep length in milliseconds
- FM modulation with five modulator shapes: vibrato, trill, siren and hiccup-style pitch movement
- Stereo balance control
- 39 built-in presets (bandwidth-check sine tones, filter and pulse driven effects)
- Export a vertical video (MP4) of the moving waveform for social media (free)
- Export audio files (WAV / M4A) with the Full Version
- Two channels for interference and beating (Full Version)
- Save your own presets (Full Version)

Great for
- Quick checks of speakers, earphones, and amplifiers
- Testing DIY effects pedals and audio circuits
- Learning waveforms, filters, and modulation
- Classroom and workshop demonstrations
- Playing with drones, beats, and modulated tones

Free and Full Version
The oscillator, waveform display, filter, modulation, numeric entry, and video export are free. Ad removal, two-channel operation, preset saving and file sharing, audio file export, and alternate app icons are available through a one-time in-app purchase.

Note
This app is intended for experiments and quick checks, not precision measurement. Start at a low volume, and take care when connecting earphones, headphones, or external speakers.

Version History The app now speaks 8 languages.

- Added German, French, Italian, Spanish, and Dutch. Choose one under Settings > Language.
- Fixed a bug where tapping the currently loaded preset again in the preset list reverted your autosaved changes to the values from when it was loaded.
- Fixed the description on the App Icon settings screen being cut off. 26.9.16 Sep 18 Quieter feedback while you shape a sound.

- The "Saved" banner that appeared after every change is gone. The folder button at the bottom now shows the name of the current preset instead.
- The first time you touch a slider, a one-time note explains that changes are saved automatically.
- The Pro purchase screen can always be closed with the close button, even if it stops responding.
- Also tidied up some internal bookkeeping. 26.9.12 Sep 12 A new way to get in touch.

- "Contact" in Settings now opens a dedicated form available in English, Japanese, Korean, Traditional Chinese and more, so you can write in the language you are reading.
- Your app version and OS version are filled in for you, so you can skip describing your setup.
- Also tidied up some internal bookkeeping. 26.9.1 Sep 1 Presets now save themselves.

- Change a sound and it is written back to the preset you have open. No more going to the preset screen to press Save (Full Version).
- Sounds you do not want to change can be locked with the lock button at the bottom of the screen. A locked sound cannot be edited, so a preset you opened just to listen to never gets overwritten. Locking works in the free version too.
- Removed the "Save changes?" prompt when you open another preset.
- Tap the preset you are already on to reload it and undo your edits.
- In the free version, changing a sound now shows "Unsaved" at the bottom of the screen, so you can see right away that it is not being kept. 26.8.29 Aug 29 The app has a new icon.

- The Home Screen icon is now Twin Waves. If you prefer the previous one, you can switch back any time from Settings > App Icon > Classic (free).
- Added Traditional Chinese. The app now appears in Chinese in Taiwan and Hong Kong.
- You can now pick the app's display language from Settings > Language, independently of your device setting. Japanese, English and Traditional Chinese are available.
- The User Guide and FAQ links now open the page in the language you are using.
- Fixed the Pro description, which said the banner was at the bottom of the screen. It is at the top. 26.8.12 Aug 12 Now you can see what your sound is actually made of.

- Tap the waveform to switch to a real-time spectrum view. You can see which harmonics are sounding, and how strongly.
- FM (pitch wobble) now offers 5 shapes to choose from. The same settings can sound completely different. New presets included: ray gun, alarm, motor and more.
- The harmonic waveform (Harm) is now available to everyone, with 5 dedicated presets added.
- Presets can now be exported and imported as files, so you can move them between devices or keep a backup.
- The preset screen has been rebuilt: delete in bulk, a visible Save button, and no more confirmation sheet every time you go back.
- Fixed several bugs, including purchase state not being reflected on screen. 26.8.4 Aug 5 Make the app your own with a new icon.

- Choose from seven Home Screen icons in Settings > Appearance > App Icon (full version). You can switch back to the original icon at any time.
- Added "About the Developer" to Settings, including other apps by the same developer.
- Press and hold + / - in the numeric input to step through values quickly. Moving the frequency from 440 Hz to 880 Hz no longer takes dozens of taps.
- Fixed minor issues. 26.8.3 Aug 3 Take the sound you made with you.

- Export the current sound as a video (MP4). It is a vertical clip with a moving waveform, ready to post on social media. Video export is free.
- Play the exported video right in the app before sharing it.
- Added audio file export (WAV / M4A) for Pro, for use as material in editors and equipment tests.
- Export from the share button at the top of the screen. Choose 5, 10, 30, or 60 seconds.
- Added an FAQ to Settings. It opens inside the app, so you no longer leave to read it. 26.8.2 Aug 1 A real filter section.

- Choose a filter type: Off, Low-pass, or High-pass.
- Q (resonance) is now adjustable. Turn it up for a peak at the cutoff and a wah-like ring.
- Pick the slope: -12, -24, -36, or -48 dB/oct. Tap the cutoff value to choose it.
- 4 new filter-driven presets: Wind Howl, Steam Valve, Distant Thunder, and Rain on Glass.
- Noise now comes in White, Pink, and Brown. The frequency slider folds away when noise is selected.
- The waveform display separates L and R, so you can see what PAN is doing.
- Copy every setting from one oscillator to the other.
- Type exact values for any parameter, and revert to the loaded preset's value.
- Redesigned Pro purchase screen.
- Fixed the high-pass filter not working correctly. 26.8.1 Aug 1 Pulse signal features.

- New "Pulse" waveform: click trains at low frequencies, buzzy tones at higher frequencies.
- AM pulse gate: repeat short beeps, with pulse width (ms) and rate as independent controls.
- 7 new presets using pulses: Sonar Ping, Lighthouse, Click Train, Ping Pong, Cricket Night, Geiger, and Heartbeat.
- Removed the click noise at note on/off edges.
- Fixed a pitch-glide artifact when switching presets.
- Fixed the preset list being hard to read on iOS 26. 26.7.29 Jul 29 Sound quality improvements.

- Reduced aliasing ("buzzy" high-frequency noise) on sawtooth and square waves for cleaner, smoother tones.
- Minor bug fixes and stability improvements. 26.7.15 Jul 15 Major design refresh and usability improvements.

DESIGN
- Unified font (DINCondensed-Bold) across the entire app
- Redesigned sliders, waveform buttons, and controls
- Added icon and animation to the Play button
- Revamped Settings screen with a clean list layout
- Refreshed promo banner with gradient and rounded corners

USABILITY
- Presets now auto-play on selection
- Preset screen opens as a half-sheet
- Improved Japanese localization in the preset screen
- Frequency slider now shows Hz units
- Removed delay on the Play button

BUG FIXES
- Fixed sliders appearing too small on compact screens (e.g. iPhone SE)

OTHER
- Removed ad banner
- Removed app open ad on launch
- Removed tracking permission prompt
- Improved stability 26.5.21 May 20 Fixed site URLs. 26.1.0 Jan 9 Fixed ad visible. 1.4.4 09/02/2023 Modification of advertisement display.
Billing price change. 1.4.3 09/01/2023 Fixed Ad systems. 1.4.2 08/21/2023 Fixed some systems. 1.4.1 01/30/2023 Thank you for using "波動 - Hysteric Oscillator".
The following changes have been made in this version. Thank you for your updates.

+ Fixed some systems. 1.4.0 12/27/2022 Thank you for using "波動 - Hysteric Oscillator".
The following changes have been made in this version. Thank you for your updates.

+ Fixed bugs.
+ Fixed Ad system. 1.3.1 04/30/2020 Thank you for using "波動 - Hysteric Oscillator".
The following changes have been made in this version. Thank you for your updates.

+ Now you can play up to 2-20Hz LFO.
+ FM / AM Rate has been expanded to 1kHz.
+ Removed ads after the stop button.
+ Fixed crash bug.
+ Changed the slider notation.
+ Fixed preset view. 1.3.0 12/03/2019 Thank you for using "波動-Hysteric Oscillator". The following changes have been made in this version:
+ Added "Preset Function". This makes it possible to save multiple slider states as they are.
+ You can use all functions for 30 minutes by watching "Video Ads".
+ Reduced the amount of change in horizontal movement of slider.
+ "PAN-> R" is displayed.

Thank you for your updates. 1.2.0 10/03/2019 Thank you for using "波動 ~ Hysteric Oscillator"!
The following content has been corrected in this version, so please update.
* Fixed a bug that the full version can not be purchased.
* Fixed the bug that the word "Label" was written. 1.1.0 07/19/2019 1.0 07/17/2019