Si Impact. Innovative digital mixing with uncompromised audio quality Drawing on over 40 years experience in live sound mixing Si Impact brings the latest digital mix innovations together with the unrivalled sound quality of Soundcraft. Designed to be as simple as an analog mixer but offer radical workflow enhancements such as the unique FaderGlow��� system massive DSP power and a pristine 32-in/32-out USB audio interface Si Impact delivers digital live sound mixing and recording for those who refuse to compromise on audio quality.