Proton Movies Speed Change Music Player made in Japan has good sound with slow speed playing.
No flapping sound with slow playback speed provides you with good listening speaking shadowing dictation training and music practice.
Furthermore you can skip silence and repeat with picking up the tempo gradually and automatically.

* Language
【recommended for those who wants to ...】
・play audio files slowly to listen high speed speaking and take dictation.
・improve listening and speaking skills by "shadowing" with tempo up repeating
・concentrate on listening and speaking without flapping sound.
・skip silence automatically to learn efficiently by "listening" "shadowing" and "speaking".
・save and load a lot of AB repeat bookmarks for speaking training.
・improve listening skills by "high speed training".
・get advanced listening skills with sound in a great chapel or changed pitch. (reverb)

* Music
【recommended for those who wants to ...】
・listen very slow audio for music dictation.
・concentrate on music dictation without flapping sound.
・repeat a same phrase with tempo up for ear training and guitar practice.
・skip silence automatically to use more time on guitar training and music dictation.
・use musical instruments practice lists by saving and loading a lot of AB repeat bookmarks.
・improve music dictation skill by "high speed training".
・change pitch of a sound and transpose music into another key.
・check or listen music in a great chapel an underground car park and a tunnela.

【features (free)】
・speed controller：0.1 slow ～4.0 fast
・faster sound at every repeat
・save and load AB repeat bookmarks.
・skipping silence to save your precious time
・playing in the background with timer
・change pitch of a sound
・a reverb aound based on acoustic experiments to reproduce
・equalizer（with a feature of avoidance clipping noise automatically）

【audio formats】
・mp3
・wma
...more than 100 formats