If you're a musician who likes to learn new songs and techniques by listening to the same piece of music over and over but wish that the music could be played a little slower, then you'll enjoy Amazing Slow Downer. You can repeat any section of the music at full speed, slow it down or even speed it up by changing the speed between 25% (1/4 of original speed) and 200% (double speed) without changing the pitch!

Player screen

The player screen contains a number of useful controls. At the bottom of the screen you'll find the regular Play/Stop and Rewind buttons as well as a Cue slider.
The Cue slider above the transport controls is used to fast forward/rewind the music for easier positioning.
Tapping the left and right arrow buttons will change the current position with the value set by the "Initial Touch Value" setting, keeping the finger down will change the position continuously. Note that you can only forward/rewind between the selected start and end points.
It's possible to automatically rewind a bit whenever the Stop button is tapped (Settings - Rewind on Stop).

Slider behavior

Since the screen is small it can sometimes be difficult to set an exact value using the sliders. You can adjust the precision when dragging a slider by sliding your finger up or down. The precision increases the farther up or down you slide your finger.
If you tap a slider button and then move your finger up or down a little bit faster than normal, no change will take place until the movement has stopped. You can now edit the previously set value with a very good precision.
You set the default values for speed, pitch and mix by moving the sliders to the middle. You can also "double tap" on any of those sliders to set them to the center position.
Read more about slider settings in the "Settings" section.

Speed slider (DSP Settings)

The slider labeled "Speed" lets you adjusts the speed between 25% (1/4 of original speed) and 200% (double speed). It's possible to disable audio processing all together (Settings - Audio Processing). If so, the software will act as a regular audio player but with looping capabilities.

Pitch slider (DSP Settings)

The slider labeled "Pitch" adjusts the pitch i.e. the tuning and transposition. The default setting is to "snap" to semitones only but if you slide your finger up or down you may adjust in cents (1/100 of a semitones) as well. To adjust the tuning, move the slider by dragging the slider. As an example: to change the key from C to D, raise the pitch by two semitones. The maximum pitch change range is +/- 12 semitones which will cover all musical keys.

Mix slider (DSP Settings)

The slider labeled Mix adjusts what channel or mix of channels you are listening to. Normally you use both channels - center position. However, sometimes the instrument you are transcribing is more prominent in one or the other of the channels. You may then choose to listen to only the left, only the right or any mix of the channels you like. The music is always sent to both the left and right channels of your headphones.


If you enable the "Loop" switch, the current song will loop between the set loop points. You can enter new loop positions by moving the sliders or by tapping the "Set" buttons located to the right of the corresponding slider.
The "Set" buttons are especially useful while the audio is playing through. If the set loop points are not accurate enough you can "trim" them to be more exact. By tapping AND holding down the "Set" buttons for a short moment, a "Trim Loops" view will appear which lets you fine adjust the loop points.
You can slide the set loop forwards or backwards with the same amount as the current loop length by tapping the left/right arrow buttons.
You can half or double the loop length by tapping the "1/2" and "x2" buttons.
Tapping the "Manage Loops" button to the right of the "Loop" switch allows you to store as many loops as you want and then recall any of them at a later time. Here you also delete unwanted loops.
Besides storing the loop positions, the selected speed, pitch and mix values will also be saved.

Equalizer - EQ

This lets you boost or cut the volume at different frequencies. For example, you can boost the mid-range to hear a particular instrument more easily.
The graphic equalizer has seven preset frequency bands ranging from low bass to high treble - 60, 150, 400, 1000, 2400, 6000, and 15000 Hz.
Moving the slider upward boosts the selected frequency band, moving it downward cuts it. Boosting the audio signal too much may result in clipping or distortion. To avoid this, use the "Preamp" slider to lower the volume.


You can export the currently loaded song using the selected settings for speed, pitch etc.
If the loop button is activated only the selected loop will be exported, else the complete song.
The exported song will be saved into "Music/Amazing Slow Downer/Exported Files" folder so that you can copy it over to your computer. You can also send the exported file using email.
"Export File" and "Export And Email File" is available in the "Application Menu".


Tapping the "Settings" menu and allows you to change certain player settings.

  • You may enable/disable the audio processing and select whether to slow down in stereo or mono. Stereo processing requires more processor usage and may drain the battery faster, mono has slightly better quality.

  • You may select a lower audio quality setting which allows for longer battery life or if using newer multi core devices you may select a higher quality setting for best sound quality.

  • "How to Select Files" allows you to either use the system file browser (defaults to Android File Picker but may be any file browser that is installed) or an internal file browser.
    Amazing Slow Downer for Android supports playback of the following file types:
    MP3, Apple M4A (aac/alac), WMA (Windows Media Audio), Wave, Ogg and FLAC. Not all file types are accessible from the built in Android music picker. If a certain file type isn't visible, then use the "File Browser".

  • You may set the number of loops to repeat before stopping or set it to loop continuously.

  • You may set a value for "Rewind on Stop" which will make the player rewind a tiny bit whenever you tap the "Stop" button.

  • "Forward/Rewind Initial Touch Value" lets you select how many seconds to "jump" when you tap the forward or rewind buttons.

  • "Forward/Rewind May Extend Loop" will extend the loop when you tap the forward or rewind buttons and the new position is outside of the set loop.

  • You may choose to increase the tempo or change the pitch after a specified number of loops. Increment will continue for the entered number of "times", then restart at the original speed/pitch.

  • You may "Delay Playback" of a track between 1 and 30 seconds.

  • Select what will happen when playback reaches the loop end point - "Wait Between Loops".

    • Immediately restart playback from the loop start point.

    • Wait a specified number of seconds before restarting the loop.

    • Wait the same amount of time as the current loop length.

  • "Allow Sleep" lets you select if you want to prevent or allow the device to sleep while using this software.

Finally you may set the behavior for the sliders:

  • "Tap Anywhere" lets you jump to a new value by tapping anywhere on a slider.

  • "Nudge Value" lets you decrease or increase the value by tapping to the left or right of the slider thumb.

  • "Limit Speed/Pitch Range" allows for easier and more exact settings if you don't need much speed or pitch change.

Happy practicing!