Roland SP-404MKII Creative Sampler and Effector - Manual (Page 20)

Playing Back Samples (SAMPLE MODE)
20
When the roll interval is set to 1/64–1/8, the sample plays back as a roll.
When the roll interval is set to 1/4, the sample plays back in a loop.
Making the roll playback interval shorter (faster) partway through
You can shorten the roll interval while it is playing back.
1. Follow the steps in “ Playing Back Samples in Detailed Steps (ROLL) (P.19)” to make the sample roll.
2. Hold down the [ROLL] button and turn the [VALUE] knob clockwise.
This shortens the roll interval. Turning the knob counter-clockwise returns the roll interval to its original value.
You can’t make the roll interval longer (slower) than the original value.