This DSP driver you want is here.

DSP1 Driver

Acustika DSP1 for driver download click here..

DSP2 Driver

Acustika DSP2 for driver download click here..

DSP3 Driver

Acustika DSP3 for driver download click here..

NPD MAP-1 Driver

Nautilus NPD MAP-1 for driver download click here..

NPD 50.6 DSP Driver

Nautilus NPD 50.6 DSP for driver download click here..

MPD 50.4 Driver download

MOJO MPD 50.4 for driver download click here..

Lenovo D1 Driver

Lenovo D1 for driver download click here..

USB Driver for Windows Installation

USB Driver for Windows Installation click here..
dsp