Practicing a tune in 12 keys more an ideal than a reality.
Clearly some do it. No doubt someone on this forum will attest its the only way. Ever.
Most of us do not.
I will often practice a standard (say autumn leaves) in 2-3 keys. The ones normally called when jamming (Bb & G or Cm or Em if you like).
You might learn it in a couple of other tunes (C (am) or perhaps one or two to accommodate a Bb or Eb horn.
But rare is the day somebody is going to call this tune in C#minor (A).
At least imo.

That being said, The singer calls the key and you need to know how to to transpose on the fly sometimes.
He/She may call it in Db. Too bad. Life goes on.

As for the tool for practicing multiple keys, BIAB is not it.
I use IrealPro in the Shed.
Changing key and tempo is pretty ease and "good enough" for working it out.
It helps me build some walking bass lines.
It helps me find some shell chords for my guitar work.

If I have a performance ready backing track I created from BIAB "musicians" I do the following.
WIth a 320kpbs mp3 I use the sharpen/flatten feature of performance playback software (Anytune Pro).
I can normally go up or down a couple of steps and the arrangement wont sound too wonky.
Sometimes I'll alter the tempo a little if it sounds a little wierd.
If I need more flexibility I'll do another arrangement a fifth away from each other.
This cover's all the bases. I rarely need to do this, but it does work.

Anyway, you may find an easier way.

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