# Check1.2 - Band Practice & PA — Recording, Tuner & Feedback

> Recording, Tuner & Feedback (iPhone/iPad app by Daisuke Kawaue.)

- Source: https://appshunter.io/ios/app/check12-band-practice-and-pa/id6792583103 (this page in markdown: same URL + `.md`)
- Developer: [Daisuke Kawaue](https://appshunter.io/developer/6792583105)
- Category: Music, Games, Music
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 21 MB
- Languages: American English, Japanese
- Released: 2026-08-03
- Data updated: 2026-11-10

## What is Check1.2?

Check1.2 finds the frequencies most likely to feed back, in Hz.
Before the show, you cannot tell which frequency to pull down.
At the FOH desk, the analyzer's red line shows the bands most likely to feed back.
The iPhone microphone is all you need. No measuring instrument, no external microphone.

The Full version is a one-time purchase. It is not a subscription.

FREE AND FULL
- Stereo recording: free is 5 minutes a take, 2 saved. Full records a whole show in one take and keeps all.
- Monitor check results: free keeps 3. Full keeps as many as you like, compares with your last visit to the same venue, and keeps what you changed.
- Normalize: free works on takes up to 5 minutes. Full works on longer takes too.
- Frequency quiz: free is Beginner, 6 bands, 2 sets a day. Full adds Advanced, 21 bands, unlimited sets.
- Accuracy by band: free today, Full all time.
- A/B comparison: free is Pop. Full has four genres.
- Instrument views: free All. Full adds drums, bass, guitar, vocal, piano.
- Spectrogram: free 3 times a day. Full unlimited.
- Speaker check "Measure with the mic", export of results, Pan position quiz, Band Timing Check: Full.
Use Restore Purchases on a new device.

Analyzer, Monitor check, voice registration, Metronome, Tuner and Speaker check are free. Spectrogram 3 times a day. No account needed.
Try Full free for 7 days; it returns to free with no charge.
Works on iPad too.

For people learning PA, people doing the PA on the day at a small venue with no dedicated engineer, and people training new PA staff at a live house.

FEATURES
- Stereo recording, no compressor and no limiter.
- Metronome with a volume slider and a beat-1 accent you can turn on or off.
- Tuner. Press a note name to hear it as a sine tone.
- Speaker check.

MONITOR CHECK (BEFORE THE SHOW)
From 15 seconds of ambient sound and your voice, it lists the bands most likely to feed back, as a number and a word, like "about 250 Hz (muddy)". While recording, a green, yellow or red lamp warns you when feedback is close. Register your voice and it also reports muddy (200-500 Hz), boomy low end (63-125 Hz), harsh (2-5 kHz) and sibilance (5-8 kHz).

A tone that stays after your voice stops is close to feedback. It listens 3 seconds to tell it from reverberation. Results stay on your iPhone with the venue name and a note, so you can compare next time.

What you do next is the real work. Turn the level down. Move the speakers or the microphone. If it still feeds back, cut the band you found with EQ, a little at a time.

ANALYZER (DURING THE SHOW)
50 Hz to 18,000 Hz, about 11.7 Hz steps, redrawn about 23 times a second.

- Green line: the sound now. White: Peak Hold. Orange dashed: the strong band.
- A tone that stands out from its neighbours and keeps doing so gets a solid red line. Musical notes are told apart by their harmonics and get no red line.
- Drag the screen to read the frequency there. Pick an instrument (All, Drums, Bass, Guitar, Vocals, Piano) for notes written for it.
- If the waveform goes flat on top, it tells you it is clipping.

FREQUENCY QUIZ
Name the frequency of a sine tone, or compare a band track with and without EQ and name the band that changed. With headphones and Advanced (full version), 63 Hz and 125 Hz join in.

HOW TO USE
Monitor Check measures the ambient sound for 15 seconds. Record your voice, press "See results" and wait 3 seconds. Read the bands most likely to feed back and what to do next.

PRIVACY
Recording, analysis, voice registration, results and venue notes stay on your iPhone. The app only connects for Apple's in-app purchase. If you email us, we get your address and message. No ads, no tracking.

NOTES
This app is not a measuring instrument. Start quiet and raise the level slowly. Stereo recording works on supported models only; others record in mono, and the app tells you first. Below 150 Hz the iPhone microphone cannot measure accurately, so feedback detection is off there. dB is not calibrated.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Try the full version for 7 days | Free | one-time |
| Full version | $6.99 | one-time |


## Is Check1.2 safe?

Not enough ratings yet to assess Check1.2.

## Is Check1.2 legit?

Check1.2 - Band Practice & PA has limited verification signals. The AppsHunter Legitimacy Score for Check1.2 is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 2.17 — 2026-11-08

2.17: Minor fixes.

Since 2.15, each feature on Home has its own color, used for that feature on every screen, and the main button on each screen is easy to find.

### 2.16 — 2026-11-08

2.16: Minor fixes.

Since 2.15, each feature on Home has its own color, used for that feature on every screen, and the main button on each screen is easy to find.

### 2.15 — 2026-11-07

2.15: Clearer buttons and colors
• Each feature on Home has its own color, and the same color is used for that feature across the app.
• Buttons now share one consistent style, so the main action on each screen is easier to find.
• Small text is a little larger and easier to read.
• Minor fixes and improvements.

### 2.14 — 2026-11-06

2.14: Results that are easy to share
• The Band Timing Check report (PDF) has a new design. Tap the bottom band to open the App Store.
• Result cards and Monitor check exports now include a link to the app.
• After your first Monitor check result, the app shows what the Full version adds.
• Minor fixes and improvements.

### 2.13 — 2026-11-05

2.13: Easier to use at the venue and in rehearsal
• The Home screen is now organized into groups such as "PA / Sound" and "Band practice".
• Each tool now ends with a button to the next tool you are likely to use.
• Recordings now support folders, search, and favorites.
• Minor fixes and improvements.

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## More apps by Daisuke Kawaue

- [Worship SPL: Church Volume](https://appshunter.io/ios/app/worship-spl-church-volume/id6815865409)

All apps by Daisuke Kawaue: https://appshunter.io/developer/6792583105

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-10.*