NO! ONLY the HA-2SE can operate as a pure line out device. NOT the mojo. Its Misleading reviews like these that made me purchase the mojo in the first place. It cannot function as a line out DAC. Simply not possible to bypass the amplifier section. the 2 button combo for pre-amp is just a volume preset, at which it gives 2v output, nothing else. Its very misleading.
I required a Portable DAC to use with my car audio system which has its own high end amplifiers. Mojo amplification made the sound horrible. the HA-2 on the other hand has pure line out which bypasses its amplifier completely so you can just utilize that brilliant sabre chip, and it sounds amazing with external amplification.
Dont get me wrong, I love the mojo, Its brilliant with my headphones. But I love my HA-2SE more as its much more versatile, and sounds almost equally good.
EDIT : My initial speculation was incorrect, The Confusion was Caused by the fact that on Line-Out mode mojo gives out 3v RMS which turned out to be 'too hot' for my system. Rob Watts was kind enough to point out that this can be resolved by a simply decreasing the Volume 10 points to 0.95v RMS.
What I gather is that the Mojo does not have a separate amplifier stage and hence the output from the mojo is theoretically the output from a 'DAC' with no added amplification and an analogue stage which is very clean.