波動 Hysteric Oscillator vs BeatMapper

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 - 42 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. 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.

BeatMapper turns your iPhone into a grid of coloured pads. Tap a pad to play its sound. Turn on Loop and the sound keeps repeating, so you can stack pad on pad and build a pattern while it runs. Tap a looping pad again to stop it. Seventeen sound sets are built in: drum kit, percussion, music box, bass, sine tones, chiptune, everyday sounds, cartoon effects, sci-fi effects, interface sounds, phonemes, greetings from around the world, the English alphabet, English numbers, Japanese words, French words, and the system sounds. Nearly four hundred sounds in all. Every pad shows what it is doing. A white square shrinks inside the pad as the sound plays, so you can see at a glance where each loop is in its cycle and how the parts line up against each other. Five buttons run along the bottom. Playing Length decides how long a sound plays. Loop makes it repeat until you stop it. Drag Action sets what happens to the pads your finger sweeps over. Randomize plays a handful of pads at once, and All Stop clears everything. The caption above each button names the item currently chosen, so nothing hides behind a symbol. The pads fill the screen. The grid is worked out from how many sounds the set has, always at least four across, so the pads stay large enough to hit with a finger. Randomize shuffles the layout, keeping each sound with its own colour, and Reset puts them back in order. Playing Length decides how long each sound runs: how long you press, the sound itself, the longest sound in the set, or that length with a little drift. Press Length turns the pad into a key you hold. Aligning to the longest sound makes every pad repeat on the same beat, and the drift spreads them so the phases pull apart and the pattern keeps changing. Auto Play taps the pads and buttons on its own, at a pace you set, and the gaps are random rather than even. Leave it running and the app plays by itself. Pro unlocks two more things: importing your own sounds from any folder on the device or in iCloud Drive, and recording what you hear as a 48 kHz / 24-bit WAV file in the Files app. Other things you can set: what appears on the pads, polyphonic playback on or off, background playback so the sounds keep going when you leave the app, and whether the status bar and home bar are shown. A Quick Guide inside Settings explains every control. No account, no setup, no menus to learn. Open it and play.