MACAST 1.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software is included in Audio & Video Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
MACAST (formerly MacAmp) is an MPEG audio decoder. It works with both MPEG1 and MPEG2 audio streams (except for the multichannel extensions defined in MPEG2), layer3 only for now.
You may want to check out more software for Mac, such as SysTools CSV to vCard For Mac, Outlook Mac Database Recovery or SysTools Mac PDF Unlocker, which might be related to MACAST.
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