# TerribleSync > Mobile tempo controller for impulse-sync music hardware. (iPhone/iPad app by Benjamin Roth.) - Source: https://appshunter.io/ios/app/terriblesync/id1109759662 (this page in markdown: same URL + `.md`) - Developer: [Benjamin Roth](https://appshunter.io/developer/448057425) - Category: Music, Utilities - Price: Free - Rating: 4.00/5 from 4 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 1 MB - Languages: American English - Released: 2016-05-04 - Data updated: 2026-06-04 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/terriblesync/id1109759662/reviews.md ## What is TerribleSync? Use your iPhone or iPad to control the tempo of impulse-sync-enabled synthesizers, drum machines, and other music hardware. Features: • Tap tempo • Supports 20.0 - 999.0+ BPM • Rotary tempo dial for precise, tactile tempo adjustment • Pause/mute button • ?, !, and :fire: buttons to introduce character and chaos into your performance • Clear, simple interface designed to be easy to use in a stage/performance setting This app works with any instrument you own that takes voltage impulses as a tempo control, such as: • KORG SQ-1, Volca, Monotribe, etc. • Teenage Engineering Pocket Operator • Moog MOTHER-32 (choose the "single clock advance" setting on the instrument) This project is open source. Try building it yourself at https://github.com/terribleben/terrible-sync or contact twitter.com/terribleben with feedback! Notes: • 3.5mm audio cable is required to connect your iPhone or iPad to your sync-enabled instruments. • If the instrument isn't responding, you may need to increase the iPhone's volume. • This software is not produced by, endorsed by, or affiliated with KORG, Teenage Engineering, Moog Music, or other instrument manufacturers. ## Key features - Tap tempo - Rotary tempo dial - Pause/mute button - Performance effect buttons - Clear interface - Open source project ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/terriblesync/id1109759662/reviews.md ### 5/5 — Great App *2023-07-14, version 1.0.2* The app is fun to play and works great! Would it be possible to add ableton link? Thanks for the app:) ### 5/5 — very nice 🔥✌️ *2022-04-08, version 1.0.2* It works and I like it ### 5/5 — Useless Clicking Sound??? 🤦‍♂️ *2021-09-06* That ‘undesirable and useless click sound’ is what allows it to sync other instruments to the iPhone. What a dummy! You use this app in tandem with other music apps on your iPhone/iPad and the music goes out mono on one channel, and the click is a “clock sync” square wave on the other channel, which (in some cases must be split using TRS stereo —> dual TS mono cables, and the clock channel) goes into the sync port of your Korg Volca, Monotribe, etc., as well as, the TE Pocket Operators and the OP-1 synth, and nearly any modular synth on the planet that responds to 0.5 VDC <= sync_signal <= 5.5 VDC control voltage signals. The click tells the sequencer when to start and stop and (usually) keeps the tempo in time and can sometimes be divided or multiplied upon by more advanced synths while being sped up or slowed down, keeping the synth in sync with the master clock device (in this case, your iPhone, with the ‘dumb, useless clicking sound’ that it makes 🤣). This app works just as intended, and it is great! Big ups to the developer for creating this utility for my iOS devices! ### 1/5 — I mean its a thing *2021-05-04* Its just a click and the 1 other review is fake just so you know, so this app just makes clicking sounds i dont get the point of it, dont listen to the other review that has 5/5 its fake ### 5/5 — Why terrible it’s not terrible *2020-03-17* Really not ### 5/5 — Terrific app *2018-02-14, version 1.0.1* Funktioniert einwandfrei! ## Frequently asked questions about TerribleSync ### What is TerribleSync? TerribleSync is a free mobile application designed to control the tempo of impulse-sync-enabled music hardware, such as synthesizers and drum machines, using your iPhone or iPad. ### How do I connect TerribleSync to my music hardware? You will need a 3.5mm audio cable to connect your iPhone or iPad to your sync-enabled instruments. Ensure your device's volume is turned up if the instrument is not responding. ### What music hardware is compatible with TerribleSync? TerribleSync works with instruments that accept voltage impulses for tempo control, including models from KORG (SQ-1, Volca), Teenage Engineering (Pocket Operator), and Moog (MOTHER-32, with specific settings). ### Does TerribleSync have ads? No, TerribleSync is ad-free. The application is completely free to use and does not display any advertisements. ### What are the tempo capabilities of TerribleSync? TerribleSync supports a tempo range from 20.0 BPM up to 999.0+ BPM, offering flexibility for various musical styles and needs. ### Can I build TerribleSync myself? Yes, this project is open source. You can find the source code and instructions for building it yourself on GitHub at https://github.com/terribleben/terrible-sync. ### How often is TerribleSync updated? The latest version, 1.0.2, was released on January 6, 2022. While updates may not be frequent, the app is stable for its intended purpose. ### What is the user sentiment for TerribleSync? Based on the available data, TerribleSync has a rating of 4.0 stars from 4 ratings, indicating generally positive user reception for its functionality. ## Version history (last 3 releases) ### 1.0.2 — 2022-01-06 This version contains minor improvements and maintenance work. ### 1.0.1 — 2016-12-05 This app has been updated by Apple to display the Apple Watch app icon. 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Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*