Connect a 1/4-inch TS cable from the OUTPUT jack to a dedicated drum amplifier or an audio mixer channel.
You can find the instruction manual in the following locations: Sound X Smi 1458 User Manual
Verify the knob is turned clockwise past zero. Confirm that the main power adapter is firmly seated in the wall outlet and the module's DC input port. Check that headphones or amplifier cables are fully pushed into their correct output ports. Double Triggering or Dead Pads Connect a 1/4-inch TS cable from the OUTPUT