Decks are connected firstly to the unit's physical audio interface, and then to a remote Mac or PC computer via USB 2.0 bus power. Interacting with Serato's "Scratch Live" digital media player, users can transfer their high-quality audio files to either of the analog or digital "Control Discs" - two of each are provided. Analog-to-digital quality conversion is performed at a 24-bit rate up to 48kHz, utilizing Serato's "Proprietary Control Scheme" technology for a nearly inaudible difference between authentic and reproduced vinyl audio. Possessing up to 25 minutes of audio content at a time as well as a "Vinyl Scroll" feature for remote laptop control, the analog Control Discs provide a safe and logical alternative to a DJ bringing his or her entire record collection to a performance and running to risk of loss or damage. Because they are constructed of an authentic wax composite, the discs are prone to eventual wear and can be replaced through Rane's online web-store. The SL 3 also features upgraded input and output jacks, including high-grade phono preamps for optimal mixing, independent line selection for expanded customization, and galvanized isolation for reduced computer noise. The addition of an auxiliary input enables the use of Serato's "Live Mix Recording" and "LiveFeed" features, while auxiliary outputs provide external sampler and effector support as well as Serato's "Sample Player" and "Virtual Deck functions.