The portamento settings are divided into equal time and equal speed. Equal time will cause sound delay and drag on the performance, so we default to equal speed, which can make the portamento produce evenly and better fit the song
The portamento rate is the response speed when using the portamento bar. The higher the rate, the faster it is. For beginners, sometimes they don't need to use the portamento bar, but portamento will be produced due to accidental touch and interfere with the performance. When we adjust the portamento rate to 1, there is no need to worry. These two parameters can be adjusted by combining the function key B and the knob