DSP Memory Region
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The DSP communicates with userland through memory locations 0x1ff40000-0x1ff77fff. Within this region are two areas of structures that are exact duplicates of each other. The DSP alternates between the use of these two areas (much like a double-buffer). Each area has 15 structures within it. The location of these structures can be obtained by reading pipe 2.
The mixer has 24 channels, each of which are individually configurable.
| Structure Number | DSP memory address | Size | Description |
| 5 | 0x8400 | 0x20 | Status (?) |
| 9 | 0x8410 | 0x260 | Debug (?) |
| 6 | 0x8540 | 0x280 | Loopback Samples (PCM16) |
| 2 | 0x8680 | 0x120 | Channel Status (x24) |
| 8 | 0x9710 | 0x1A40 | ? |
| 4 | 0x9430 | 0xC4 | Main Configuration |
| 7 | 0x9492 | 0x1400 | ? |
| 1 | 0x9e92 | 0x1200 | Channel Config (x24) |
| 3 | 0x9430 | 0x300 | GC-ADPCM Coefficients (x24) |
| 10 | 0xa912 | 0x200 | |
| 11 | 0xaa12 | 0x180 | |
| 12 | 0xaad2 | 0x300 | |
| 13 | 0xac52 | 0x14 | |
| 14 | 0xac5c | 0x2476 | - |
| 0 | 0xbfff | 0x2 | Frame Counter |