Yamaha SY85 Owner's Manual (feature Reference) (image) - Page 188

Quantization is generally used to tighten up sloppy timing. Use it judiciously, however, because timing that is too perfect can sound cold and mechanical - unless, of course, you're specifically aiming for a cold, mechanical feel. Always use a quantize value that is at least as "short" as the shortest notes in the track to be quantized. If you quantize a track containing 16th notes to 1/8 (8th notes), for example, some of the 16th notes will be aligned with 8th note beats, thus ruining the track. The various quantize values correspond to note lengths as follows: SONG EDIT MODE / SONG JOB 187