Karaoke discs are a special type of DVD-Video disc which have the same navigation structures. A typical DVD-Video karaoke disc contains songs which are formatted as titles. Titles are generally grouped into video title sets (VTS) based upon the artist, the performer or a particular musical style. The principal difference between karaoke and standard DVD-Video is the way the audio streams are structured.

Karaoke discs are required to contain multichannel audio, usually Dolby 5.1 AC-3. Channels 0 and 1 contain the background instrumental music, and are generally directed to the left and right speaker, respectively. Channels 2 through 5 can have any combination of guide vocals, guide melodies, and sound effects.

SetAMXMD (Set Audio Mixing Mode for Karaoke) performs operations to set the appropriate mixing mode to send a channel to the left speaker, to the right speaker, to both speakers, or to no speakers by setting the proper bits in the input operands.
The following mixing modes are available:

Mix channel 2 and channel 0 (to the left speaker).

Mix channel 3 and channel 0 (to the left speaker).

Mix channel 4 and channel 0 (to the left speaker).

Mix channel 2 and channel 1 (to the right speaker).

Mix channel 3 and channel 1 (to the right speaker).

Mix channel 4 and channel 1 (to the right speaker).

The mixing mode can be specified as one of the following:
1) the parameter is in another GPRM register, or
2) the parameter is in SetAMXMD's operand.

Set Audio Mixing Mode for Karaoke
SetAMXMD    GPRM0 GPRM1 GPRM2 GPRM3 GPRM4 GPRM5 GPRM6 GPRM7 GPRM8 GPRM9 GPRM10 GPRM11 GPRM12 GPRM13 GPRM14 GPRM15
DVD Command	Hex Encoding
SetAMXMD GPRM0	44 00 00 00 00 00 00 00

This command can be combined with the Compare GPRM operations for conditional branching. When combining, this command is executed only if the result of the comparison is true.

1) Compare to another GPRM register and SetAMXMD
2) Compare to another SPRM register and SetAMXMD
3) SetAMXMD and Link