Choose a presetPick Slowed + reverb, Super slowed, Nightcore or Sped up. The sliders move to the right place, and you can fine-tune them.
Speed and pitchBelow 100% the song gets slower and lower. Above 100% it gets faster and higher, like a record played at a different speed.
ReverbReverb is what gives slowed songs their dreamy sound. More reverb and a bigger room make it more spacious.
Listen and downloadYou can move the sliders while it plays. When you like it, download the file as MP3 or WAV.
Slowing a song down also lowers its pitch: that is the sound of slowed + reverb and nightcore. If you want to change the speed without changing the pitch, use the Speed & Pitch Changer. The downloaded file is a few seconds longer than the slowed song, so the reverb can fade out.