Yamaha Reface YC - Manual (Page 6)

reface Reference Manual 6
EG rates can be set between “0” (slowest) and “127” (fastest) for each operator.
1.
Press the [EDIT] button to activate Edit mode.
2.
Press the [EG rate] button.
The EG Rate Settings screen is displayed.
3.
If necessary, press the [EG rate] button several times to select the operator you wish to set.
4.
Change the settings for Rate 1 to Rate 4 by using the sliders.
5.
If necessary, alternately use the [EG level] and [EG rate] buttons to adjust the overall shape of the envelope.
6.
When you have finished making settings, press the [EDIT] button once again to leave Edit mode.

EG Rate Settings screen
EG Rate
1 Rate 1
0 to 127
Attack rate
2 Rate 2 Decay rate
3 Rate 3 Sustain rate
4 Rate 4 Release rate
1 2 3 4