speakers. Ancillary equipment Digital Audio Interface The Digital Audio Interface (DAI) was the input/output path between the Digital Editing System and external hardware. The DAI received raw source data from session tapes and passed the data on to the editing system's computer for storage. Finished (edited) data passed through the DAI from the editing system's computer to a DTR for creation of a master tape. During the editing process, data from the editing system's computer passed through the DAI to a Digital Audio Conversion Unit (DAC Box) in the editing room. The DAI resided in the Editing System's computer and contained a one-megabyte FIFO. Realtime input/output capacity was eight channels of 16-bit audio data at any of the then standard sample rates. Digital Delay Unit To allow for a preview channel during the LP cutting process, Soundstream built a digital delay unit (DDU). Digital data from tape could be delayed by a user selectable time: 3ms to 1.308s in increments of 5.12ms. Delay was accomplished by the use of a variable-depth FIFO or ring buffer. S-1610 adapter So that users of the Sony PCM-1610 Digital Audio Processor could take advantage of Soundstream's editing system, the company developed the S-1610 Adapter. The adapter was a bidirectional two-channel format converter. Data from the Sony PCM-1610 were converted to the format used by the Soundstream DTR so that the data appearing at the input to the Digital Audio Interface looked to the DAI as if it had come from a DTR. Similarly, finished (edited) data in Soundstream format were restored to the Sony format by the adapter. Sony data were imported/exported at either of the two sample rates 44.1 kHz or 44.1/1.001 kHz. Any metadata in the Sony format were lost in the format conversion. This was a format conversion only, the adapter did not do sample rate conversion. M adapter So that users of the 3M Digital Mastering System could take advantage of Soundstream's editing system, the company developed the M Adapter. The adapter was a bidirectional eight-channel format converter. Data from the 3M Digital Mastering System were converted to the format used by the Soundstream DTR so that the data appearing at the input to the Digital Audio Interface looked to the DAI as if it had come from a DTR. Similarly, finished (edited) data in Soundstream format were restored to the 3M format by the adapter. DAC box Essentially derived