Sansui AU D7 amplifier question

[souravin]

Hello friends, I have recently procured Sansui AU D7 in excellent condition. Have some confusion on the presence (tone control), recording selector and Mode (Stereo L-R et al.). Can I listen to mono in this?

Would appreciate if any FM can educate me or point me towards these functionalities.

Here is the link

Sansui AU-D7 | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine

Thanks in advance .