Yeah my iFi iEMatch arrived, which has -12db or -24db functions.
But unfortunately it does make everything sound a bit dull. Also as you said the increase in volume is weird, it's like at 1 it start pretty loud, but between 1 to say like 20 it gets louder very slowly, it's a very gradual slope.
Out of curiosity I tried high gain, high gain do sound better than low gain on the Playmate 2.
And I might be crazy but........ I kind of like the stock opamp LOL.
I bought the V6 Classic and everything sounds smooth and creamy and organic but the vocal got pushed back. Everything is front and centre with stock opamp. Does V6 Vivid push the vocal back even more?