Creative SB0350 Hardware Programming Guide - Page 62
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4-4 Mixer Chip Programming CT1335 Mixer This section describes the features and register functions of the CT1335 mixer chip used on the Sound Blaster 2.0 CD Interface card. Features CT1335 is a mono mixer chip that only controls the output mixing. It has the following features: Volume Control CT1335 provides independent 8-level volume control for the Master, MIDI and CD sources. The Voice source has 4-levels of volume control. Output Mixing The output mixing path takes signals from the Voice, MIDI and CD, as well as the PC Speaker. To silence a source, you can either reduce the source volume to zero or terminate the source activity. Register Functions The following notations are used to describe the detailed register map of CT1335: Index 0x00 0x02 0x06 0x08 0x0A "0xRR" represents the mixer register number in hexadecimal. The grayed areas of the table represent reserved bits. D6 D5 D4 D3 D2 Master volume MIDI volume CD volume Voice volume D7 D1 D0 Reset Mixer Figure 4-1: Register Map of CT1335 Mixer