Roland MT-300S Owner's Manual page 44

Mastering the Basics
Recording the Left-Hand Part
Now, record and listen to your performance of the left-hand part.
Although the procedure is the same as in "Recording the right-hand part," you will
need to substitute the following step.
In Step 4 of "Recording the right-hand part," press the [3] button, and confirm that its
indicator has started flashing.
fig.25-6_20
R
Recording Along with Accompaniment
Now, you might want to try recording your own performance using both hands while
playing along with accompaniment.
In this case, you need to select a song that features accompaniment.
Although the procedure is the same as in "Recording the Right-Hand Part," you will
need to change the procedure as shown below.
Prevent the right-hand and left-hand parts from sounding by pressing the [3] and [4]
buttons, turning off their indicators. Then, have the accompaniment parts play by
pressing the [R] and [2] buttons, turning on the indicators for those buttons.
fig.25-7_30
R
lit
In Step 4 of "Recording the Right-Hand Part," press the [1] button, and confirm that its
indicator has begun flashing.
fig.25-8_30
R
44
1 2 3
Blinks alternately in red and green
1 2 3
lit dark
1 2 3
Blinks in red
4
4
dark
4