The Catwalk LPG/VCA is Waveform's DIY Project #5. These are utilities that attach to your Eurorack system in a completely new way, taking up no HP. By switching out one component this can be either a Low Pass Gate or Voltage Controlled Amplifier (actually, since it's passive, it's an attenuator NOT an amplifier), and the faceplate is reversable to show if it's a VCA or LPG. Faceplate is black with silver.