The BP-1W has three distinctive MODES that can be changed between by using the onboard switch in the center of the main panel.
| Position | Effect |
|---|---|
| RE | A warm, fat sound that recreates the distortion of a Roland RE-201 preamp, using a newly designed circuit. |
| NAT (natural) | Gives a boost sound with a wide range. |
| CE | An aggressive distorted sound with bite that recreates the distortion of the CE-1 preamp, using a newly designed circuit. |