Variable speed (0.5x to 3.5x), noise reduction, and equalizer.

The requested file, , refers to an outdated and unofficial modified version of the popular Android application. While the legitimate app is highly rated, using "unlocked" or "MOD" versions from third-party sites like AbbasPC carries significant security risks. App Overview

The current official version is v11.7.x , making v6.3.7 extremely obsolete. Key Features:

Modified APKs from unofficial sources often bypass the developer's licensing to provide "Pro" features for free. Using these versions is risky for several reasons: Smart AudioBook Player v6.3.7 APK (Unlocked) - AbbasPC

Supports Chromecast, Android Auto, and various file types like MP3 and M4B. Risks of "Unlocked" APKs