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China Export LOL. A funny mistake but it's really from China. Indeed, Shanling is a top-class audio equipment manufacturer in China. They also do OEM or even ODM for some hi-end CDPs as I know.

I just not wanted to draw that things.

I simulated at low gain mode. The circuit works fine while input voltage is 6Vpp and the volume is max, but the total gain of jazz is lower than 1.

Well, while in 'high' gain mode and max volume, when the input voltage is 6Vpp (just a little above 2Vrms), the input of the last OPA209 gets weird.

I drawed a (simplified) schematic of Jazz (without the feedback network). The volume control is achieved by changing the parallel feedback resistor between VolCtrl_A and VolCtrl_B. I don't think it is a clever design as it will change the gain of the first 2 OPAMPs during volume adjustment.