The TR-808 machines had been revised at some point in time, Roland had changed the noise circuit, so the revised machines have snare drums that sound darker but more realistic than earlier versions. the SD-808 follows the revised late version. With snappy and accent cranked up to the maximum the SD808 really smacks your eardrums!!!
The module has following parameters:
LEVEL adjusts the output level of the module
TONE. controls the timbre and also the tuning of the drum
SNAPPY sets the amount of noise and simulates the snares (those metal strings below a real snare drum)
ACCENT controls amount of the Accent-CV
If there´s no CV at the Accent jack the gate voltage will be sent to the Accent via a normalization. This gives you a powerful, direct sound without patching anything. It´s intensity can be controlled by the accent potentiometer and the overall volume with the level control