h6. [[SoundChannels]] h6(. » [[SoundChannels SWI Calls|SWI Calls]] h6((. » Sound_WriteControlBlock h2. Sound_WriteControlBlock h5. (SWI &4018C) |_<^{width:4em}. Entry | | | R0 |<^. Channel number (1 - 8)| | R1 |<^. Offset to read from (0 - 255)| | R2 |<^. 32-bit word to write| |_<^{width:4em}. Exit | | |<^. R0 |<^. Preserved (or 0 if fail, invalid channel, or invalid write offset) | |<^. R1 |<^. Preserved | |<^. R2 |<^. previous 32-bit word (if R0 non-zero on exit) | h4. Use Writes 32-bit data values to the [[Sound Channel Control Block]] (SCCB) for the designated channel. This call can be used to read parameters not catered for in the [[Sound_Control]] calls returned by Voice Generators, using an area of the [[Sound Channel Control Block|SCCB]] reserved for the programmer.