The DSP Programs and the Surround Decoder modes are 2 different things and not the one and the same thing. The DSP Programs are proprietary to Yamahs and predate Dolby ever even considering employing height and or ceiling speakers. Yamaha were employing 'presence' speakers well in advance of Dolby even introducing Atmos in cenemas and before Dolby developed Pro Logic IIz or Audyssey's introduction of DSX.
Most take the michael out of the DSP Programs and regard them as gimmicks, I suspect because of the OTT Beer Keller and Cellar options associated with the music DSP Programs, but the MOVIE options can be quite effective and do produce more room filling atmosphere than either Dolby Surround or Neural:X upmixing. The fact is that they can also be edited and changed to suit most tastes. Many also dislike the "echo", but this can be diminished by altering the settings for that particular Program. Room size and delay settings are editable for all the DSP Programs.
The only upmixing ever engaged by the receiver while a DSP Program is engaged will be DTS NEO:6. This is set by default and isn't an option that van be edited or changed by the AV receiver. It used to be the case that you could select Pro Logic on the the older Yamaha models, but this was later dropped with later models.
In order to avoid confusion, I's tend to use the term upmixing modes when relating to the Surround Decoder modes as opposed to DSP processing. You'd otherwise be inferring that you are taling about the DSP Programs.
Yes, my A1080 has an AUTO mode in the SUR. DECODER options. It doesn't always result in what I'd want though so I don't use that option.
The SURROUND DECODE mode has to be differentiated from the SUR. DECODER modes. The latter are a group of mostly upmixing modes while the former is a mode that according to Yamahs "
The surround decoder enables multichannel playback from 2-channel sources without sound field effects.". No idea as to why you'd need this rather than using STRAIGHT? Maybe they mean that Music DSP Programs would still be applied to the 2 channel audio without upmixing to the other speakers while this mode is engaged?
The last option in the DSP Programs is SURROUND DECODE and not SURROUND DECODER!