You actually threw something away ?
I think you have got 4 on / off switches, the speed control bit is probably to do with the motor windings. My guess is that the brown (from mains) is the live and when blue is pressed it feeds to the others which when pressed feed to a seperate winding or a third brush on the motor. Doubt you can really make much of it - but knowing you , you'll turn it into something.
Wake me up by noon please.