Spark is a music player for Android devices, based on the concept of a classic cassette player. It supports all the most common music formats and can play audio files of any size. The interface is designed to be similar to the one of a real cassette player, with the exception of the lack of a physical button to play or pause the music.

The app is also capable of displaying the audio level of the current track, the elapsed time, and the playback rate. This is done by using the audio output of the device, which can be the speaker or the microphone.

If you want to add the music you are listening to your collection, you can do it by entering the folder name, or the track name.

You can choose between the following options:

The music can be played in a new window, or in the current window, depending on the mode.

The music can be paused, or stopped, depending on the mode.

You can switch between the music and the audio output, or switch to the microphone input, to listen to the sounds around you.