Rev Soft Inc has developed a Space Synth Effect Plug-in for Android's Perfect Piano and Walk Band. It is a sound plugin that cannot run alone and requires Perfect Piano to be installed first. Once installed, users can easily switch to the Space Synth sound by selecting the switch instrument icon and then selecting the Space Synth icon.

The Space Synth Effect Plug-in offers a unique and futuristic sound that is perfect for music enthusiasts. However, it is recommended to adjust the sustain time through the app's settings to make the sound more comfortable. Overall, Rev Soft Inc has done an excellent job in creating a plugin that adds a new dimension to the Perfect Piano and Walk Band apps.