Peaks:

Xperia T volume 1: -61.2 dB

Level maching with Xperia T on identical digital volume:
Galaxy S volume 1, WM8994 gain -14dB: -61.6dB

Level maching with Xperia T using analog amp settings benefits:
Galaxy S volume 15, WM8994 gain -57dB: -57.7dB
Galaxy S volume 14, WM8994 gain -57dB: -60.4dB
Galaxy S volume 13, WM8994 gain -57dB: -63.3dB
Galaxy S volume 13, WM8994 gain -55dB: -61.9dB
Galaxy S volume 13, WM8994 gain -54dB: -61.3dB * best match