The Doepfer A-100KRD Rotary Knob (Red) is a Replacement Rotary Knob for Doepfer A-100 Modules. Coloured Knobs are useful for visually sorting certain Functions. For example, all Audio Controls could be in one colour and all CV Controls in another. The same logic could be applied to VCOs, Filters, Envelopes, LFOs, and so on.

Alternatively these Rotary Knobs can be used to create a more colourful and interesting appearance for your Modular Synthesizer.