This is a very common vocalise, and it is very valuable. Low voiced singers should give it a shot, though they might want to transpose it down a little bit. The Scorch plug-in can help you with that.
Be sure to keep each note part of legato phrase. Don’t allow choppy-ness to enter unless you are specifically working on staccato.
![2 Octave Tonic Arpeggio Ascending [A .png for those without Scorch]](http://beginning-singer.iansidden.com/wp-content/uploads/2009/08/2-Octave-Tonic-Arpeggio-Ascending--238x300.png)