First off is the Musiland Monitor  01 US DAC. This is a USB based  Audio interface, making use of a  custom DSP to elegantly get past  many of the hurdles imposed by  the USB platform.   Next up is the Musiland Monitor  01 USD. This is similar to the  Monitor 01 US, but does not have  a built in DAC. It does feature a  BNC SPDif output, ideal for  systems that already have a DAC. © Gert Byleveldt 2011