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.

Check out video where I demo how BD-2 can be used to achieve bluesy sounds from Marshall JCM 900:

 

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Eddie