The opcodes that write audio signals are:
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Synchronous output: out, out32, outc, outch, outh, outo, outq, outq1, outq2, outq3, outq4, outs,outs1, outs2 and outx
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Streaming output: soundout and soundouts
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User defined channel output: outvalue
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Direct from zak output: outz
The opcode monitor can be used for monitoring the complete output of csound (the output spout frame).
See the section Software Bus for input and output through the API.