The Focusrite ISA 2-Channel 192kHz A/D Card allows the Focusrite ISA ONE preamp to be used as a high-quality two-channel ADC to convert analog signals to various digital formats (AES, S/PDIF and ADAT). And, since AD should be the last process on your input chain (before recorder), this system lets you insert a signal processor, such as a compressor or EQ, between the ISA Preamp and the ISA sound card. The ISA 2-Channel 192kHz A/D Card also has connections for word-clock in/out.