----LME49720HA is a dual "metal can" opamp and it sounds different than the plastic dual versions.
----Single version of LME49720HA is LME49710HA. They sound different according to other people when used in various different applications. I will know for myself as i ordered another 2xLME49710HA+Adaptor to use and compare in the soundcard and also compare them in m-stage.
Let us know if the metal can thing really makes a difference over the plastic LM4562. I'm still skeptical.