Rudolf 556 is an analogue-sounding drum machine. It has six separate drum engines, two of which are bass drums, two are snares and two are hihats. Each engine has three parameters:
- L (Length) - pretty obvious what this controls. The higher the value, the longer the drum will sound.
- H (Hardness or Harshness) - when this value is small the drum will sound "soft" and when it's large it will sound "hard". Basically it controls the amount of noise that is mixed in.
- V (Volume) - basic gain control.
Meaningful values for all parameters range from 0 to 1. You can modify the parameters from the GUI by scrolling with the mouse over the knobs.
The different engines are mapped to incoming MIDI Note On events for the notes C, D, E, F, G and A, in any octave.