int error = SetChannelAttributes(APTR handle, APTR chandle,
                struct hwTagList *tags);

HWSCATAG_VOLUME:

Change the channel's volume to the volume specified in the iData member of this tag item. Volumes are specified in the range of 0 (mute) to 64 (full volume).

HWSCATAG_PANNING:

Change the channel's panning value to the value specified in the iData member of this tag item. Panning values range from 0 (left speaker only) to 255 (right speaker only). The default panning is 128 which means centered audio output.

HWSCATAG_PITCH:

Change the channel's pitch to the value specified in the iData member of this tag item. The pitch value specifies the number of PCM frames that are to be played per second.

handle

audio device allocated by OpenAudio()

chandle

audio channel allocated by AllocAudioChannel()

tags

taglist containing attributes to modify (see above)

error

error code or 0 for success