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The early constructions and disciple phase:

  • 1975 Carbon analysis filters (fathers project)
  • 1976 Divided Stage PA for isis (H. Hogg's idea)
  • 1978 Smooth singing guitar distortion (still unique!)
  • 1979 The PA and light system for Lizard (obsolete)
  • 1980 Multi tap Digital Delay (obsolete)
  • 1981 The first Polyphonic experiences
  • 1982 C32 discrete Digital Signal Processor (H. Hogg's idea and project)
  • 1983 Image compression (diploma work at ETH, obsolete)
  • 1983 The rolling Stage (Renato Capellis project)

The products:

Projects and ideas:

  • Auto power off for acoustic guitar (in new Rolf Spuler guitars!)
  • POLYMODULE Concept to standardize polyphonic guitars and make it accessible for lutiers
  • POLYSUBBASS for monophonic guitars
  • Flexibility Amp (Modular combo for acoustic guitar / mic... drawing available)
  • Flat Volume pedal
  • "Banjo with interconnected strings" (a dream)
  • Vapor solar generator for socialized clean energy
  • Acoustic piano with Bass Pedal and magnetic feedback
  • Percussion instruments with piezo pickups (prototypes working!)
  • Jam as a solution for the Bahian unemployment