What is a sound module and why is it needed?

Electronic drum kits require a sound and trigger module that trigger cables from the pads are attached to. When you hit a trigger pad with a stick, an electric Trigger Pulse (or Trigger Signal) is sent to the Trigger/Sound Module. Inside the trigger module, the signal is analyzed and recognized as an actual drum hit if the signal is sharp enough. Depending upon which pad was hit and how hard you hit it, the note event is assigned a note number and a note velocity. So if you hit a snare pad really hard, a message of "Note On, note number 23 on channel 2 with a velocity of 111" might be sent to the MIDI Out jack of the trigger module. This would soon be followed by a "Note Off, note number 23 on channel 2" message.  This message is sent to the sound module to trigger the sound which is heard through the heaphone or audio output. The module will also send MIDI data to its MIDI Out jack, and you which can be recorded to a midi sequencer though most modules have a sequencer in them.

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