The ideal combination for recording four microphone sources would be to have a Focusrite Platinum TwinTrak Pro with optional digital card connected to the SPDIF input on the Saffire, providing a full complement of Focusrite front-end. (Any Platinum with digital card would be fine though.) Novation? S X-Station has a SPDIF Out, which would also be a good combination with the Saffire; a backing track could be played on the keyboard and recorded whilst a singer and guitarist are recorded simultaneously.
Alternatively, the Focusrite owner with no digital i/o could go directly into the Line input(s) to convert to digital, gain access to additional signal processing and then send to the recording platform. More.
One possible option is to connect Focusrite hardware equipped with a digital output to one of Saffire PRO's digital inputs, allowing additional classic Focusrite pre-amplification to stream directly to the DAW. The S/PDIF In could be used to receive audio from the TwinTrack PRO, for example. In addition, the stereo SPDIF output from the X-Station could be sent to the SPDIF In of the Saffire PRO 10 i/o, leaving the other 8 analogue inputs free for Guitars, vocals, drums etc. more.
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