I  have a Boss DR-880 Drum machine. I also have the Line 6 DT-25 Amp.

If you have a Line 6 DT-25 or Line 6 DT-50 Amp,Patch the Left out of your

Drum machine into the   Effects Return on the Back of the Amp.

These Amps come with the Effects SEND/RETURN 1/4 inputs located on

the Back,You dont need to plug anything in to the Send you just need to

use the Return to plug in the Left side of your Drum machine.

Note: If you don't have a DT amp, any Amp with Effects return will work.

.