Originally Posted by
davewerden
My thought on that is...
If a student is advanced enough to need range outside the Arban, then it is high time to get comfortable with transposition. Up and octave and down an octave should come first and the two offer nearly unlimited range development potential. Also, LOTS of the exercises are so well patterned that you can extend them up/down beyond the written limits.
Once you have the high/low notes (which I do), you can play some of the 150 songs up or down an octave to develop more control over the notes you think you "have in your pocket" (trust me on that!!).
I have offered a few tips on my "how to" playlist on YouTube for extending the Arban book. Here is the latest. Note that it is SO simple that almost anyone can do it on the fly (i.e. without writing it out). Of course, this tip and the ones above could apply to most method books.