Piezo 是 Mac OS X 平台上一款小巧、简单且易用的 音频录制 软件，由 Rogue Amoeba 公司开发，很多人可能对该公司的另一款产品 Audio Hijack Pro 比较熟悉。相较于后者，Piezo 是该公司从0起步开发的一款全新的产品，并不是 Audio Hijack Pro 的精简版，这么做很大程度上是为了能够通过 Mac App Store 的审核（绝大部分同类型的应用都无法通过 Mac App Store 的审核）。
和 Audio Hijack Pro 以及 Ambrosia 软件公司推出的 Wiretap Studio 类似，Piezo 也可以直接从具体的应用程序中获得音频信号进行录制，比如本文配图中，笔者就正在录制豆瓣电台中播放的音乐（Safari 应用程序），当然也可以录制电脑麦克风的音频信号。
从功能上来说，Piezo 远没有 Audio Hijack Pro 和 Wiretap Studio 强大，但易用性是 Piezo 的一大非常明显的特点。你唯一能够控制的只有：音频源、录制文件保存的类型、录制文件保存的位置以及给录制的文件起名字或添加介绍。在录制的品质方面也丝毫不打折扣——AAC 256kbps 立体声。
What's New in Piezo
Version 1.6.2:
Piezo's tracking of physical input devices has been overhauled and dramatically improved. It will now better handle issues caused by many USB audio devices, automatically tracking devices across restarts and between ports on your computer, so fewer adjustments are necessary.
An issue where AAC recording did not work correctly on MacOS 10.15 (Catalina) has been corrected.
Piezo's “wizard” window has received many backend updates and improvements.
Version 1.6.1:
Piezo now has preliminary compatibility with MacOS 10.15 (Catalina).
The backend Audio Capture Engine (ACE) has been updated to 11.0.0, with preliminary MacOS 10.15 (Catalina) compatibility as well as other fixes and improvements. ACE is now required to use Piezo. If it is not currently installed, you'll be prompted to install it at launch.
On MacOS 10.14 (Mojave) and higher, Piezo now offers general Dark Mode support on windows throughout the app.
Piezo now requires MacOS 10.12 (Sierra) or higher. If you're still on 10.11 (or lower), be sure to see our Legacy page.
Piezo's Help menu now includes a useful new Release Notes window, so you can see changes across all versions from right inside the app.
Small interface changes have been made, including changes to the Message windows used to convey certain information to the user.
The About box has been updated to provide additional version information in an easy-to-read fashion.
The "Wizard" used for installing, updating, and removing ACE (among other things), has been overhauled, with many small improvements and enhancements.
Version 1.6.0:
Enhancement:
The reliability of audio recording under heavy loads has been increased
Improvements and interface modifications have been made to Piezo's Source selector, as well as the audio device icon
The Audio Capture Engine (ACE) backend has been updated to 10.0.1, for the most robust and reliable audio capture
Bug Fix:
An issue where Piezo's popover could incorrectly display multiple connectors on MacOS 10.14 (Mojave) has been corrected
A ridiculously rare bug (known internally as the "wiggle freeze"), where jiggling windows with skillful timing could cause the Settings popover to get stuck out of position, has been fixed
Version 1.5.11:
Major Enhancement:
Audio Capture Engine (ACE) has been updated to 9.1.2, with MacOS 10.14 (Mojave) compatibility and a fix for capturing audio from Voice Memos and other ports from iOS to Mac ("Marzipan" apps)
Fixed:
Piezo now better handles error reporting when attempting to capture from apps which require the ACE extra
Piezo's source selector now behaves better with sources requiring ACE
VoiceOver has been updated to work around a change Apple made on MacOS 10.14. Menu items will again properly reflect the most recent action taken
