Boss DD3 thru a 75 50watt marshall

[guitarteck]

Heres a problem im not understanding. my delay is the last pedal in the chain
ihave a 50 watt marshall that I drive with a sansamp GT2 but i can barely hear the delay at all any ideas? with the sans amp off it works fine

[cjlectronics]

What about other pedals in front of the DD3? How does the DD3 react with a Boss Distortion or Blues Driver in front of it?

[guitarteck]

always worked great until i added thetech21 san amp pedal before it i think it just compressed the hell out of the dd3