Yamaha O2R Owner's Manual page 139

The following illustration shows the second screen - TAPE 1 through 16
and the effect returns, EFFl and EFF2:
Select this screen by pressing a [SEL] button for the tape or effect returns
channels.
Fine-Tuning the Delay
You can adjust the delay either samples [Smpl] or milliseconds [mSEC]
with coarse or fine precision just by the placement of the cursor on the
selected channel.
For example, if the cursor is positioned over the thousands digit of the
samples [Smpl] field, when you rotate the encoder wheel, the values
increase or decrease by thousands of samples.
If the cursor is positioned over the hundreds or tens digit of the samples
field, when you rotate the encoder wheel, the values increase or decrease
by hundreds or tens of samples.
The same is true when the cursor is positioned over the ones digit of the
samples field, or the tens, ones, or decimal digits of the milliseconds
[mSEC] field.
MIXING Display Functions
Digital Recording Console 02R User's Guide
35