@humanoid01 take a look at page 19 of the manual for the Beatstep, it has pitch, velocity, and gate outputs for connecting to your synth and a USB port for your computer. One potential example for your rack would be Pitch to Plaits V/Oct, Gate to a Batumi oscillator Reset/Sync to retrigger it then onto a VCA modulating the Plaits output (using Batumi here since I don't see an envelope generator), and velocity to another VCA to control amplitude. I don't have a Beatstep though so I'm making this up from looking at it. Anyway, you can review the manual here: http://downloads.arturia.com/products/beatstep-pro/manual/BeatStepPro_Manual_1_0_0_EN.pdf
my tunes: https://stevehand.bandcamp.com/