Songs tested:
1. Corrinne May - Angel in Disguise (Safe in a Crazy World)
2. Johann Strauss II/ Josef Strauss: Pizzicato Polka (Denon Hi-Fi Strings XRCD)
3. Pachebel: Canon (Denon Hi-Fi Strings XRCD)
4. Mozart: Sinfonia Concertante for Violin, Viola & Orchestra in E-flat Major, KV364 (320d) (Denon Hi-Fi Strings XRCD)
5. Il Divo - I Believe in You (Ancora)
6. Arne Domnerus - Limehouse Blues (Jazz at the Pawnshop Disc 1)
7. Diana Krall - Black Crow (The Girl in the other Room)
8. Jane Zhang - 我用所有报答爱(The Banquet)

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currently sitting in the opamp socket in my Heed: the 637s haha!