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OK, I have received complete data from Crystal Semiconductor on the CS4248 audio codec in the TP750. It is one of their standard off-the-shelf parts. Here is the general description of the part: "The CS4248 is a mixed signal integrated circuit that provides 16-bit audio for computer multimedia systems. The CS4248 includes stereo audio converters and complete on-chip filtering for record and playback of 16-bit audio data. The CS4248 combines conversion, analog mixing, and programmable gain and attenuation to provide a complete audio subsystem in a single 68-pin PLCC or 100-pin TQFP package. The CS4248 includes an 8-bit parallel interface to the industry standard ISA bus." A complete register mapping is included in the data. There are also device drivers available for Windows 3.1 and NT, as well as diagnostic software. The Monologue software is also available in the Crystal data book (apparently it was a joint development by Crystal and First Source). The CS4248 is functionally equivalent to the Analog Devices AD1848 rev. K chip. The phone number for Crystal Semiconductor (Austin, TX) is (512) 445-7222. --andy