使用支持
简洁、准确的吉他调音与自由识音工具
无法识别琴弦
确认已允许麦克风权限，将 iPhone 靠近吉他音孔，一次只拨动一根弦。环境嘈杂时，可以先点选目标琴弦再调音。
提示音太小
请提高媒体音量，并检查声音是否被蓝牙耳机或其他音频设备接收。
更改基准音高
在主界面底部双击“基准音高”，然后选择所需频率。440 Hz 是最常用的国际标准。
反馈问题
请通过 App Store 产品页面中的开发者联系信息与我们联系，并附上 iPhone 型号、iOS 版本和问题出现时所用的调弦方案。
StringTrue Support
Fast, precise guitar tuning and chromatic pitch detection
Pitch is not detected
Allow microphone access, hold your iPhone near the guitar sound hole, and pluck one string at a time. In noisy surroundings, select and lock the target string before tuning.
The in-tune sound is too quiet
Raise the media volume and check whether audio is being routed to Bluetooth headphones or another device.
Change reference pitch
Double-tap Reference Pitch at the bottom of the tuner, then choose a frequency. A4 = 440 Hz is the most widely used standard.
Report an issue
Use the developer contact information on the App Store product page. Please include your iPhone model, iOS version, and the tuning preset you were using.