Each voice is triggered via MIDI note, including Accent. The standard 1 octave midi mapping ranges from C3 to B3 (11 analog voices + Accent). The 8raw8 is not velocity sensitive on purpose. It kills the oldschool drum machine vibe. Only Accent can accentuate the overall volume/tone on the desired steps of your drum pattern, just like the original 808. MIDI Processing is very fast, allowing you to create those 808 "trap" drumrolls with ease.