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I personally have a big range of songs which I find difficult to get "nice". All recordings of the Electric Light Orchestra (bad spectrum), Lady GaGa (almost no headroom to begin with), Robby Williams Let Me Entertain You (needs decompress to keep hearing the singer), Earth Wind and Fire recordings are in my personal opinion one of the best analog recordings ever, they all should sound brilliant, to test a nice radio punch I use Amii Steward Knock on Wood and Venus Bananarama, John Miles Music for AGC testing, for mid tones Beach Boys recordings especially the old ones and many other old sixties recordings, all Carly Simon recordings are deplorable and are therefore used to test the effect of the total setup, some parts of Cee Lo Green hits sound dirty in a way below 100 hz hit the red to long and to strong and that should be corrected by ST, Rah Band Clouds across the Moon (after all is set) should not have more loudness then all others this one seems to "drop through" all limiters in the wrong setup, EMF Unbelievable easy gets compressed to much in the wrong setup to a big pile of loudness blowing away the singer, First Class Beach Baby very poor recording, very very difficult to get beautiful harmonics in it, Gloria Gaynor How High the Moon I was not able to put this one online yet impossible to get it sound nice in between the rest. Jon and Vangelis I Hear You Now / Surrender Jon Anderson test mid & high if not to strong. all Little River Band recordings should sound like heaven these are really really good, Ronan Keating recordings easily get to much loudness in them when settings are out of balance, Stevie Wonder Songs in the Key of Life album should sound wonderful also great recording!
These should set you up. For these we all use HD wav recordings streaming in MP3 vbr ~256 kbps
and then comes the task of configuring the AGC to eliminate fast gain rising which leads to "pumping" and loud "jumps" which leads to "blasting", though you do want to keep a certain percent of "jumps" to preserve the peak dynamics, the clipper can handle the slight overshoot provided your AGC is correctly set to match the clipper at AGC peaks of 0dB with -6dB for average headroom.