Yamaha Electone EL-87 Owner's Manual page 121

About Quantize
The Quantize function is a process of rounding off timing and/or
duration values.
With Real Time Write
It allows you to automatically correct the timing of the notes you
play, according to the specified Quantize resolution. The range can
be corrected is within 50 percent of the selected note (Quantize)
value.
With Step Write
It allows you to automatically correct the length (duration) and
timing of each note you enter.
* The finest timing is a Click (=1/24 beat).
* [ ] advances 16 clicks every step.
117