LooplinePlace sounds on the timeline and let it loop.

Tap a square to place a sound and tap it again to remove it. On tracks that show note names, drag a placed block up or down to change its note. Tap a track name to choose its sound, mute, clear or remove it; hold the name and drag to move the track. Tap Add track under the timeline for more instruments: you can try each sound before adding it, and add the same one more than once. My loops saves your loop on this device, shares it as a link, or downloads it as audio. The space bar plays and stops.