Boss BD-2 is one of those simple pedals you can use to boost your signal. The pedal can give you a clean boost which may help your amp to kick into overdrive.
To achieve clean boost keep the Gain control down to a minimum, open up the Level control to desired setting, open up the Tone control to add any treble.
The BD-2 does colour your sound a little, but it is nothing too bad.
The BD-2 does have a ligher sound when used as clean boost compared to the Boss OD-3.
The pedal works well with valve or transistor amps and is versatile in its use.
Hope to see you soon again for more updates on sound and pedals and guitar technique.