Known for founding, developing and leading Groove Tubes, now owned by Fender Music Instruments Corporation (FMIC), Aspen’s inventions, such as the Tube Matching Technology and the Speaker Emulator, changed the way we play and record guitar. His audio designs have earned multiple utility patents both in the USA and around the world besides garnering top awards in multiple fields including the prestigious TEC award for best microphone design.

His last innovation: Center Point Stereo Spacestation with it's True 3D Sound™ technology.