Square Lead Sound Plugin is a free multimedia application developed by Rev Soft Inc. It is a plugin for the Perfect Piano and Walk Band apps and cannot run alone. This plugin allows users to change the sound of their keyboard to a cello instrument.

To use this plugin, users need to first download and install the Perfect Piano app from Google Play. Once installed, they can enter the keyboard screen and select the switch instrument icon. The cello icon will automatically appear, and users can select it to load the new sound.

It is suggested to change the sustain time through the app settings to make the sound more comfortable. If users encounter any issues, they can contact Rev Soft Inc at

Overall, Square Lead Sound Plugin is a useful addition to the Perfect Piano and Walk Band apps, providing users with a new sound option to enhance their music experience.