I own the Proceed AVP. I may be wrong on this because I only use the digital inputs but the input level has to be adjusted to not overload the analog to digital converters. These converters convert the signal to the digital domain for all of the surround modes with the exception of the analog two channel bypass mode. I don't think it matters how high the input is for this mode since its completely in the analog domain but the AVP may require you to adjust the input level anyway because you may switch to one of the surround modes that requires the signal to be converted to the digital domain. Some CD players and DACs like Theta DACs have very high output levels and can easily overload the analog inputs on a digital AV Processor. Madrigal may have a better explaination for why this is necessary but that is my understanding of the issue.
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