Additional documentation or experience with Topping D90, L90 and LA90 (e.g. channels)?

[datasundae]

I recently purchased the Discrete stack (D90, L90 and LA90). I am pleased with the sound but I still find the documentation pretty thin (and tiny even in the PDF ;-). Has anyone found more documentation or had experience with the D90 and L90. There are "feature" I can select with the remote but I don't know what they do or how to use them. Channels 1 and 2 are a good example. I don't see any information on what they actually do and how to configure them.

Thanks in advance,

Hagen