Yamaha DSP-Z9 Owner's Manual page 49

Special considerations when recording
DTS software
The DTS signal is a digital bitstream. Attempting to
digitally record the DTS bitstream will result in noise
being recorded. Therefore, if you want to use this unit to
record sources that have DTS signals recorded on them,
the following considerations and adjustments need to be
made.
For LDs, DVDs and CDs encoded with DTS, when your
player is compatible with the DTS format, follow its
operation instructions to make a setting so that the analog
signal is output from the player.
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