A buffer serves as a sub-memory with respect to a hard disk and performs a data recording/reproducing operation. With this arrangement, even if the access rate of data in the hard disk is not so high, data transfer between the hard disk and an audio I/O, a MIDI I/O, and image I/O can be performed, and...http://www.google.de/patents/US5519684?utm_source=gb-gplus-sharePatent US5519684 - Digital recorder for processing in parallel data stored in multiple tracks
